diff --git a/src/modules/chatelet/components/BookRoomDialog.vue b/src/modules/chatelet/components/BookRoomDialog.vue
new file mode 100644
index 0000000..eccdb5d
--- /dev/null
+++ b/src/modules/chatelet/components/BookRoomDialog.vue
@@ -0,0 +1,332 @@
+<script setup lang="ts">
+import { computed, ref, watch } from 'vue'
+import { useForm } from 'vee-validate'
+import { toTypedSchema } from '@vee-validate/zod'
+import * as z from 'zod'
+import { toast } from 'vue-sonner'
+import { format } from 'date-fns'
+import { Check, CheckCircle2, Copy, Loader2, Wallet, Zap } from 'lucide-vue-next'
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Textarea } from '@/components/ui/textarea'
+import {
+  FormControl,
+  FormDescription,
+  FormField,
+  FormItem,
+  FormLabel,
+  FormMessage,
+} from '@/components/ui/form'
+import { useAuth } from '@/composables/useAuthService'
+import { formatSats } from '@/lib/utils/formatting'
+import { useBookingFlow } from '../composables/useBookingFlow'
+import type { AvailabilityResult, Room } from '../types/room'
+
+interface Props {
+  room: Room
+  /** The availability quote the guest just saw — dates + nights + price. */
+  availability: AvailabilityResult
+  isOpen: boolean
+}
+
+interface Emits {
+  (e: 'update:isOpen', value: boolean): void
+  /** Fired once when the invoice settles, before the dialog closes. */
+  (e: 'booked', bookingId: string): void
+}
+
+const props = defineProps<Props>()
+const emit = defineEmits<Emits>()
+
+const { currentUser } = useAuth()
+const flow = useBookingFlow()
+
+// --- Guest details form --------------------------------------------------
+
+const formSchema = computed(() =>
+  toTypedSchema(
+    z.object({
+      num_guests: z.coerce
+        .number()
+        .int()
+        .min(1, 'At least one guest')
+        .max(props.room.max_guests, `This room sleeps up to ${props.room.max_guests}`),
+      guest_contact: z.string().max(200, 'Too long').optional(),
+      message: z.string().max(1000, 'Too long').optional(),
+    }),
+  ),
+)
+
+const form = useForm({
+  validationSchema: formSchema,
+  initialValues: { num_guests: 1, guest_contact: '', message: '' },
+})
+const isFormValid = computed(() => form.meta.value.valid)
+
+const onSubmit = form.handleSubmit(async (values) => {
+  const pubkey = currentUser.value?.pubkey
+  if (!pubkey) {
+    toast.error('Sign in to book a room')
+    return
+  }
+  try {
+    await flow.request({
+      room_id: props.room.id,
+      guest_pubkey: pubkey,
+      check_in: props.availability.check_in,
+      check_out: props.availability.check_out,
+      num_guests: values.num_guests,
+      guest_contact: values.guest_contact?.trim() || undefined,
+      message: values.message?.trim() || undefined,
+    })
+  } catch (e: unknown) {
+    toast.error(e instanceof Error ? e.message : 'Could not request the booking')
+  }
+})
+
+// --- Display helpers -----------------------------------------------------
+
+function longDate(ymd: string): string {
+  return format(new Date(ymd + 'T00:00:00'), 'EEE, MMM d')
+}
+
+const stayLabel = computed(
+  () => `${longDate(props.availability.check_in)} → ${longDate(props.availability.check_out)}`,
+)
+const nightsLabel = computed(
+  () => `${props.availability.nights} night${props.availability.nights === 1 ? '' : 's'}`,
+)
+
+/** Hold expiry as a wall-clock time, so the guest knows how long the invoice lives. */
+const holdExpiry = computed(() => {
+  const iso = flow.booking.value?.expires_at
+  if (!iso) return ''
+  const d = new Date(iso)
+  return isNaN(d.getTime()) ? '' : format(d, 'p')
+})
+
+const step = computed<'form' | 'invoice' | 'confirmed'>(() => {
+  if (flow.isPaid.value) return 'confirmed'
+  if (flow.quote.value) return 'invoice'
+  return 'form'
+})
+
+watch(
+  () => flow.isPaid.value,
+  (paid) => {
+    if (paid && flow.booking.value) emit('booked', flow.booking.value.id)
+  },
+)
+
+// --- Open / close --------------------------------------------------------
+
+const confirmClose = ref(false)
+
+function handleClose(open: boolean) {
+  if (open) return
+  // Closing mid-invoice abandons the hold; it expires on its own, but
+  // make the guest confirm so a stray tap doesn't lose the QR.
+  if (step.value === 'invoice' && !confirmClose.value) {
+    confirmClose.value = true
+    return
+  }
+  confirmClose.value = false
+  emit('update:isOpen', false)
+}
+
+watch(
+  () => props.isOpen,
+  (open) => {
+    if (open) {
+      flow.reset()
+      confirmClose.value = false
+      form.resetForm({ values: { num_guests: 1, guest_contact: '', message: '' } })
+    } else {
+      flow.reset()
+    }
+  },
+)
+</script>
+
+<template>
+  <Dialog :open="isOpen" @update:open="handleClose">
+    <DialogContent class="sm:max-w-[425px] max-h-[90dvh] overflow-y-auto">
+      <DialogHeader>
+        <DialogTitle>{{ room.title }}</DialogTitle>
+        <DialogDescription>
+          {{ stayLabel }} · {{ nightsLabel }}
+        </DialogDescription>
+      </DialogHeader>
+
+      <!-- Step 1: who's coming -->
+      <form v-if="step === 'form'" class="space-y-4" @submit="onSubmit">
+        <div class="rounded-lg bg-muted/50 p-3 text-sm flex items-baseline justify-between">
+          <span class="text-muted-foreground">Total</span>
+          <span class="font-semibold text-foreground">
+            <template v-if="availability.quote_sat != null">
+              {{ formatSats(availability.quote_sat) }}
+            </template>
+            <span
+              v-if="availability.quote_fiat != null"
+              class="text-muted-foreground font-normal"
+            >
+              (≈ {{ availability.quote_fiat }} {{ availability.currency }})
+            </span>
+          </span>
+        </div>
+
+        <FormField v-slot="{ componentField }" name="num_guests">
+          <FormItem>
+            <FormLabel>Guests</FormLabel>
+            <FormControl>
+              <Input type="number" min="1" :max="room.max_guests" v-bind="componentField" />
+            </FormControl>
+            <FormDescription>Sleeps up to {{ room.max_guests }}</FormDescription>
+            <FormMessage />
+          </FormItem>
+        </FormField>
+
+        <FormField v-slot="{ componentField }" name="guest_contact">
+          <FormItem>
+            <FormLabel>
+              Contact
+              <span class="text-muted-foreground font-normal">(optional)</span>
+            </FormLabel>
+            <FormControl>
+              <Input placeholder="Email or phone, in case the host needs to reach you" v-bind="componentField" />
+            </FormControl>
+            <FormMessage />
+          </FormItem>
+        </FormField>
+
+        <FormField v-slot="{ componentField }" name="message">
+          <FormItem>
+            <FormLabel>
+              Note to the host
+              <span class="text-muted-foreground font-normal">(optional)</span>
+            </FormLabel>
+            <FormControl>
+              <Textarea rows="3" placeholder="Arrival time, questions…" v-bind="componentField" />
+            </FormControl>
+            <FormMessage />
+          </FormItem>
+        </FormField>
+
+        <Button type="submit" class="w-full" :disabled="!isFormValid || flow.isRequesting.value">
+          <Loader2 v-if="flow.isRequesting.value" class="mr-2 h-4 w-4 animate-spin" />
+          {{ flow.isRequesting.value ? 'Holding your dates…' : 'Continue to payment' }}
+        </Button>
+      </form>
+
+      <!-- Step 2: pay the invoice (events / restaurant invoice-card pattern) -->
+      <div v-else-if="step === 'invoice'" class="py-2 space-y-4">
+        <div class="text-center space-y-1">
+          <h3 class="text-lg font-semibold">Pay to confirm</h3>
+          <p class="text-sm text-muted-foreground">
+            <template v-if="flow.hasWalletWithBalance.value">
+              Scan with any Lightning wallet, or pay from your LNbits wallet below.
+            </template>
+            <template v-else>
+              Scan with any Lightning wallet, or open it in your wallet app.
+            </template>
+          </p>
+        </div>
+
+        <div class="bg-muted/50 rounded-lg p-4 space-y-3">
+          <!-- White background regardless of theme so phone cameras parse it. -->
+          <div class="mx-auto w-fit overflow-hidden rounded-lg border border-border bg-white p-2">
+            <img
+              v-if="flow.qrCode.value"
+              :src="flow.qrCode.value"
+              alt="Lightning payment QR code"
+              class="block h-56 w-56 sm:h-64 sm:w-64"
+            />
+          </div>
+          <div class="flex items-baseline justify-between">
+            <span class="text-xs text-muted-foreground">Amount</span>
+            <span class="font-mono text-sm font-semibold text-primary">
+              {{ formatSats(flow.booking.value?.deposit_sat ?? 0) }}
+            </span>
+          </div>
+          <div class="flex gap-2">
+            <Button variant="outline" size="sm" class="flex-1 font-mono text-xs" @click="flow.copyInvoice">
+              <Check v-if="flow.copiedInvoice.value" class="mr-2 h-3.5 w-3.5" />
+              <Copy v-else class="mr-2 h-3.5 w-3.5" />
+              {{ flow.copiedInvoice.value ? 'Copied' : 'Copy' }}
+            </Button>
+            <Button variant="default" size="sm" class="flex-1 text-xs" @click="flow.openExternalWallet">
+              <Zap class="mr-2 h-3.5 w-3.5" />
+              Open in wallet
+            </Button>
+          </div>
+        </div>
+
+        <Button
+          v-if="flow.hasWalletWithBalance.value"
+          size="lg"
+          class="w-full"
+          :disabled="flow.isPayingWithWallet.value"
+          @click="flow.payWithWallet"
+        >
+          <Loader2 v-if="flow.isPayingWithWallet.value" class="mr-2 h-4 w-4 animate-spin" />
+          <Wallet v-else class="mr-2 h-4 w-4" />
+          {{ flow.isPayingWithWallet.value ? 'Paying…' : 'Pay from my LNbits wallet' }}
+        </Button>
+        <p
+          v-else-if="flow.userWallets.value.length > 0"
+          class="text-center text-xs text-muted-foreground"
+        >
+          Your LNbits wallet is empty — pay with an external wallet using the QR
+          or "Open in wallet" above.
+        </p>
+
+        <div v-if="flow.isPaymentPending.value" class="text-center space-y-1">
+          <div class="flex items-center justify-center gap-2">
+            <div class="animate-spin w-4 h-4 border-2 border-primary border-t-transparent rounded-full"></div>
+            <span class="text-sm text-muted-foreground">Waiting for payment…</span>
+          </div>
+          <p class="text-xs text-muted-foreground">
+            Your dates are held<template v-if="holdExpiry"> until {{ holdExpiry }}</template>.
+            Confirmation lands automatically — no need to refresh.
+          </p>
+        </div>
+
+        <p v-if="confirmClose" class="text-center text-xs text-destructive">
+          Close without paying? The hold expires on its own. Tap outside again to close.
+        </p>
+      </div>
+
+      <!-- Step 3: paid -->
+      <div v-else class="py-4 space-y-4 text-center">
+        <CheckCircle2 class="mx-auto h-12 w-12 text-primary" />
+        <div class="space-y-1">
+          <h3 class="text-lg font-semibold">You're booked</h3>
+          <p class="text-sm text-muted-foreground">
+            {{ stayLabel }} · {{ nightsLabel }}
+          </p>
+        </div>
+        <div class="rounded-lg bg-muted/50 p-3 text-sm space-y-1 text-left">
+          <div class="flex justify-between">
+            <span class="text-muted-foreground">Booking</span>
+            <span class="font-mono">{{ flow.booking.value?.id }}</span>
+          </div>
+          <div class="flex justify-between">
+            <span class="text-muted-foreground">Paid</span>
+            <span class="font-semibold">{{ formatSats(flow.booking.value?.deposit_sat ?? 0) }}</span>
+          </div>
+        </div>
+        <p class="text-xs text-muted-foreground">
+          Check-in details arrive as a private Nostr message from the host.
+        </p>
+        <Button class="w-full" @click="emit('update:isOpen', false)">Done</Button>
+      </div>
+    </DialogContent>
+  </Dialog>
+</template>
diff --git a/src/modules/chatelet/composables/useBookingFlow.ts b/src/modules/chatelet/composables/useBookingFlow.ts
new file mode 100644
index 0000000..26e49fa
--- /dev/null
+++ b/src/modules/chatelet/composables/useBookingFlow.ts
@@ -0,0 +1,143 @@
+import { computed, onUnmounted, ref } from 'vue'
+import { toast } from 'vue-sonner'
+import { SERVICE_TOKENS, tryInjectService } from '@/core/di-container'
+import type { PaymentService } from '@/core/services/PaymentService'
+import type { ChateletApiService } from '../services/ChateletApiService'
+import type { BookingQuote, BookingRequest } from '../types/booking'
+
+const POLL_MS = 2000
+
+/**
+ * Drives one booking from request → invoice → paid. Modeled on events'
+ * useTicketPurchase: the backend holds the dates and returns a bolt11;
+ * this composable renders it (QR / copy / open-in-wallet / pay from the
+ * LNbits wallet) and polls settlement until the invoice is paid. The
+ * extension's paid-invoice listener is what confirms the booking
+ * server-side — the guest only needs to see "paid" to know the dates
+ * are theirs.
+ */
+export function useBookingFlow() {
+  // DI, never a direct import (workspace rule).
+  const api = tryInjectService<ChateletApiService>(SERVICE_TOKENS.CHATELET_API)
+  const paymentService = tryInjectService<PaymentService>(SERVICE_TOKENS.PAYMENT_SERVICE)
+
+  const quote = ref<BookingQuote | null>(null)
+  const qrCode = ref<string | null>(null)
+  const isRequesting = ref(false)
+  const isPaymentPending = ref(false)
+  const isPaid = ref(false)
+  const copiedInvoice = ref(false)
+
+  let pollTimer: ReturnType<typeof setInterval> | null = null
+
+  const paymentRequest = computed(() => quote.value?.payment_request ?? '')
+  const booking = computed(() => quote.value?.booking ?? null)
+
+  const userWallets = computed(() => paymentService?.userWallets ?? [])
+  const hasWalletWithBalance = computed(() => paymentService?.hasWalletWithBalance ?? false)
+  const isPayingWithWallet = computed(() => paymentService?.isProcessingPayment.value ?? false)
+
+  /** Hold the dates and get the invoice; starts the settlement poll. */
+  async function request(data: BookingRequest): Promise<BookingQuote | null> {
+    if (!api) return null
+    isRequesting.value = true
+    try {
+      const q = await api.requestBooking(data)
+      quote.value = q
+      try {
+        qrCode.value = paymentService ? await paymentService.generateQRCode(q.payment_request) : null
+      } catch (err) {
+        console.error('Error generating QR code:', err)
+      }
+      startPolling(q.payment_hash)
+      return q
+    } finally {
+      isRequesting.value = false
+    }
+  }
+
+  function startPolling(hash: string) {
+    stopPolling()
+    isPaymentPending.value = true
+
+    const check = async () => {
+      try {
+        const status = await api?.getPaymentStatus(hash)
+        if (status?.paid) {
+          isPaid.value = true
+          stopPolling()
+        }
+      } catch (err) {
+        // Transient network errors just mean "try again next tick".
+        console.error('Error checking booking payment status:', err)
+      }
+    }
+
+    void check()
+    pollTimer = setInterval(check, POLL_MS)
+  }
+
+  function stopPolling() {
+    if (pollTimer) {
+      clearInterval(pollTimer)
+      pollTimer = null
+    }
+    isPaymentPending.value = false
+  }
+
+  async function copyInvoice() {
+    if (!paymentRequest.value) return
+    try {
+      await navigator.clipboard.writeText(paymentRequest.value)
+      copiedInvoice.value = true
+      setTimeout(() => (copiedInvoice.value = false), 1500)
+    } catch {
+      // Insecure context / old browser — "Open in wallet" still works.
+    }
+  }
+
+  function openExternalWallet() {
+    if (paymentRequest.value) paymentService?.openExternalWallet(paymentRequest.value)
+  }
+
+  /** Pay from the logged-in user's LNbits wallet; the poll picks up settlement. */
+  async function payWithWallet() {
+    if (!paymentService || !paymentRequest.value) return
+    try {
+      await paymentService.payWithWallet(paymentRequest.value, booking.value?.deposit_sat, {
+        showToast: false,
+      })
+    } catch (err) {
+      toast.error(err instanceof Error ? err.message : 'Wallet payment failed')
+    }
+  }
+
+  function reset() {
+    stopPolling()
+    quote.value = null
+    qrCode.value = null
+    isPaid.value = false
+    copiedInvoice.value = false
+  }
+
+  onUnmounted(stopPolling)
+
+  return {
+    quote,
+    booking,
+    paymentRequest,
+    qrCode,
+    isRequesting,
+    isPaymentPending,
+    isPaid,
+    copiedInvoice,
+    userWallets,
+    hasWalletWithBalance,
+    isPayingWithWallet,
+    request,
+    copyInvoice,
+    openExternalWallet,
+    payWithWallet,
+    reset,
+  }
+}
diff --git a/src/modules/chatelet/views/ChateletDetailPage.vue b/src/modules/chatelet/views/ChateletDetailPage.vue
index 2000bdb..ae43195 100644
--- a/src/modules/chatelet/views/ChateletDetailPage.vue
+++ b/src/modules/chatelet/views/ChateletDetailPage.vue
@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { computed, onMounted, ref, watch } from 'vue'
-import { useRoute } from 'vue-router'
+import { useRoute, useRouter } from 'vue-router'
 import { toast } from 'vue-sonner'
 import { addDays, format } from 'date-fns'
 import { MapPin, Users } from 'lucide-vue-next'
@@ -9,10 +9,14 @@ import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
 import { Label } from '@/components/ui/label'
 import DatePicker from '@/modules/base/components/DatePicker.vue'
+import { useAuth } from '@/composables/useAuthService'
 import { useChatelet } from '../composables/useChatelet'
+import BookRoomDialog from '../components/BookRoomDialog.vue'
 import type { AvailabilityResult, Room } from '../types/room'
 
 const route = useRoute()
+const router = useRouter()
+const { isAuthenticated } = useAuth()
 const { getRoom, checkAvailability } = useChatelet()
 
 const room = ref<Room | null>(null)
@@ -21,6 +25,10 @@ const checkIn = ref('')
 const checkOut = ref('')
 const checking = ref(false)
 const result = ref<AvailabilityResult | null>(null)
+const showBooking = ref(false)
+/** Quote snapshot the dialog books against — survives the page's own
+ *  `result` being cleared once the dates are taken. */
+const bookingQuote = ref<AvailabilityResult | null>(null)
 
 // Same YYYY-MM-DD wire format the DatePicker speaks; the availability
 // endpoint takes the same strings.
@@ -42,6 +50,8 @@ watch(checkOut, () => {
   result.value = null
 })
 
+const YMD = /^\d{4}-\d{2}-\d{2}$/
+
 onMounted(async () => {
   try {
     room.value = await getRoom(route.params.id as string)
@@ -50,6 +60,14 @@ onMounted(async () => {
   } finally {
     loading.value = false
   }
+  // Dates survive a trip through /login (see onBook) as query params.
+  const qi = route.query.check_in
+  const qo = route.query.check_out
+  if (typeof qi === 'string' && YMD.test(qi) && typeof qo === 'string' && YMD.test(qo)) {
+    checkIn.value = qi
+    checkOut.value = qo
+    if (room.value) await onCheck()
+  }
 })
 
 async function onCheck() {
@@ -64,6 +82,36 @@ async function onCheck() {
     checking.value = false
   }
 }
+
+/**
+ * Booking needs a Nostr identity (the extension DMs check-in details to
+ * the guest pubkey), so anonymous guests bounce through /login and come
+ * back here with their dates intact. Guest checkout is a later slice.
+ */
+function onBook() {
+  if (!result.value?.available) return
+  if (!isAuthenticated.value) {
+    const back = router.resolve({
+      path: route.path,
+      query: { check_in: checkIn.value, check_out: checkOut.value },
+    }).fullPath
+    router.push({ path: '/login', query: { redirect: back } })
+    return
+  }
+  bookingQuote.value = result.value
+  showBooking.value = true
+}
+
+/** The dates are taken now — drop the stale quote so the card resets. */
+function onBooked() {
+  result.value = null
+  checkIn.value = ''
+  checkOut.value = ''
+}
+
+watch(showBooking, (open) => {
+  if (!open) bookingQuote.value = null
+})
 </script>
 
 <template>
@@ -138,12 +186,22 @@ async function onCheck() {
                   (≈ {{ result.quote_fiat }} {{ result.currency }})
                 </span>
               </p>
-              <Button class="w-full mt-3" disabled>Book — coming soon</Button>
+              <Button class="w-full mt-3" @click="onBook">
+                {{ isAuthenticated ? 'Book' : 'Sign in to book' }}
+              </Button>
             </template>
             <p v-else class="text-destructive">Not available for those dates.</p>
           </div>
         </CardContent>
       </Card>
     </div>
+
+    <BookRoomDialog
+      v-if="room && bookingQuote"
+      :room="room"
+      :availability="bookingQuote"
+      v-model:is-open="showBooking"
+      @booked="onBooked"
+    />
   </div>
 </template>