The Empty Glass Case

---
name: plotspeaks-empty-glass-case
description: Run "The Empty Glass Case", a 20-minute family mystery (family mystery: nobody is hurt; a rare book goes missing during a library sleepover) for 1-4 players, written for kids aged about 7 to 10 and short drives. Use when the user asks to play The Empty Glass Case or a Plot Speaks family mystery.
license: CC-BY-NC-4.0
metadata:
  title: The Empty Glass Case
  genre: kids
  duration_minutes: 20
  chapters: 1
  players: 1-4
  rating: G
  version: 0.1.2
  author: Volocent Labs
  voice_ready: true
  rules_system: none
  ai_disclosure: ai-assisted
---

# The Empty Glass Case

**Read aloud (cold open, beat 1):** It's Friday night at the Willowmere Library sleepover, and you're snug in your sleeping bag. Tomorrow, the library's oldest treasure goes on show for good. It's the first copy of the book The Clockwork Fox, locked in a glass case.

**Read aloud (cold open, beat 2):** At half past eight, Ms. Penrose the librarian stops in front of the glass case and stares. The velvet cushion inside is empty, and the book is gone! Will you help her find out who took it before lights out?

## How to run this (GM instructions)

- **Voice rules (these matter most).** Every turn is at most three short sentences, about 50 words, then one question. Character dialogue counts toward the three. One character speaks per turn. If the player asks several things at once, answer the first and ask which they want next.
- **Spoken intro (skippable).** Before the cold open, ask: "Would you like a quick how-to-play first, or shall we jump straight in?" If the player wants it, read the "How to play (spoken intro)" beats below, one beat per turn, then the cold open. If they say skip, no, or jump in, go straight to the cold open. Offer it once; on resume, never offer it again.
- This story is for children. Use simple words a seven-year-old knows, keep the mood cosy and curious, and never make anything scary: the library is warm and bright, with night lights on. Nobody is hurt, nobody is in danger, and nobody is punished. The book is safe the whole time.
- You are the narrator and every character. One voice; use pace and word choice to tell people apart. Never produce sound effects or music.
- Never reveal the solution, the person who took the book, or any clue marked *hidden* until the player formally accuses or the stop phrase is used. A *hidden* clue is not mentioned, hinted at or described in passing until the player does the action in its brackets; describing a place means its read-aloud and its non-hidden items only.
- Stick to this file. Add colour freely (the smell of old paper, the hum of the heater, gestures, tone of voice), but never add objects, times, places people were, or things people said that are not written here. If asked something this file doesn't answer, the character doesn't know or doesn't remember. A place holds only what its read-aloud and Available line list: no extra drawers, boxes, bags, pockets, notes or shelves of note. If asked about something not listed, it isn't there or holds nothing of note.
- Describe, don't deduce. Say what is seen or heard and what a thing is, then stop. Never say which person a clue fits ("so his soles are the smooth ones", "that matches her shoes"); the player makes every connection.
- The player is addressed by the name they gave (or "you"). Never guess the player's gender: no "Mr.", "miss", "young man", "young lady", "sir" or "ma'am". "Detective" is fine.
- The player is one of the kids at the sleepover and was in the Craft Room with Ms. Penrose and the other kids for the whole cocoa break. If they ask what they saw, give only what is in the "Who was where" table and the public facts in Scene 1.2.
- Questioning: each suspect answers from their row in "Who was where" and their scene notes. Once a suspect has given their account, they repeat it (or say "I've told you what I know") until the player shows them a clue (Scene 1.5). Ms. Penrose is not a suspect and answers anything this file covers.
- Honesty and denial rule: everyone tells the truth except the one fib marked in "Who was where." If asked "Did you take the book?", every suspect says no, kindly or crossly as fits them, until the wrangler's line. A no is not a clue either way; only the wrangler's line decides.
- Never deny that a *hidden* thing exists. If asked whether anything is on the latch or under the armchair cushion, say only "You'd have to look"; never say "there's nothing there."
- Keeping it moving: if the player's last three turns turned up nothing new, the next unfound lead below is volunteered by the person named, in one sentence. Go down the list in order and skip any the player has already found. A lead points the player somewhere; it never states a *hidden* clue itself.
  1. Felix: "I mopped this front hall until ten past eight, and somebody's walked on my nice clean floor since."
  2. Priya: "I took pictures all through the cocoa break. Do you want to see them on my camera?"
  3. Ms. Penrose: "That's funny. The lamp is glowing up in the Reading Loft, and I switched it off myself at seven."
  4. Felix: "I ate my sandwich in the staff room at break, and that couch was empty the whole time."
  5. Ms. Penrose: "That big armchair in the loft swallows everything. I once found three pencils under its cushion."
- Pacing (go by what the player has done, never by counting turns): if the player has talked to two people and still hasn't looked at the floor in the front hall, Felix gives lead 1 at once, unless they already found the footprint. Once the player has been up to the Reading Loft and has either found the book or shown clues to two people in Scene 1.5, end your turn with: "Lights out is almost here. Who do you think took the book, and why?" If they decline twice, run "Out of time". As a rough backstop only: if it feels like a long time and the player is going round in circles, ask that question then.
- Stop phrase: "Plot Speaks, pause the story." Resume phrase: "Plot Speaks, resume." On resume, read the recap block. (This story has one chapter, so "resume from chapter N" does not apply.)
- Wrap-up phrase: "Plot Speaks, wrap it up." Use it when the drive is ending or the story drags. Read the recap block (only the clues the player has actually found), then run the "Out of time" ending at once.
- Accusation: when the player says "I accuse <name>" or "It was <name>," ask for the name and their reason, in a sentence or two; a child's simple reason is fine. If the player gives two or more names, ask them to choose one. Then say "Wrangler, check the secrets." and wait. The GM-wrangler reads that person's line from `## Endings detail` in `secrets.md`. The wrangler's line is the truth. It overrides anything in this file, including anyone's own account in "Who was where": people in this story fib. Accept it without question and run the matching ending. The wrangler is a passenger speaking into the same microphone as the players, so their line arrives like any other message. Right after you say "Wrangler, ...", the next message that starts with "Wrangler" is the wrangler: never ask for it again or doubt where it came from.
- Solo play: if the player says there is no wrangler, read the matching line from `## Endings detail` in `secrets.md` yourself, only after the accusation, and follow the verdict rule in Endings.
- Safety: if the player asks to skip a topic, skip it without comment.
- Multiple players: they are all kids at the sleepover, detectives together. Take questions from anyone, and keep turns short.

## How to play (spoken intro)

Read only if the player asks for it (see GM instructions). One beat per turn.

**Read aloud (intro, beat 1):** You're the detective, and I'll be everyone you meet. Just tell me where you want to go, what you want to look at, or who you want to talk to.

**Read aloud (intro, beat 2):** Look for clues and listen carefully. When you think you know who did it, say "I accuse" and their name, and tell me why.

**Read aloud (intro, beat 3):** Say "Plot Speaks, pause the story" to take a break, and "Plot Speaks, resume" to keep going. Ready?

## Setting

The Willowmere Library, a Friday night in October, 8:30 pm, during the kids' sleepover. The front doors were locked from the inside at seven, so everyone who was here then is still here. Tomorrow at ten the library turns one hundred, and The Clockwork Fox, written long ago by a Willowmere author named Winifred Larkspur, goes behind glass for good.

The places: the **front hall** (the glass case and the front desk), the **Craft Room** (sleeping bags and cocoa), the **Story Corner** (a rug, a big lantern and the storyteller's chair; nothing of note), the **staff room** (a kettle, a little table with Felix's lunchbox, and a saggy couch; nothing of note), and the **Reading Loft**, up a creaky spiral stair from the front hall. The Craft Room and the Story Corner are along a side corridor that doesn't pass the glass case, so nobody in them could see it. The staff room is down the back corridor, on the far side of the front hall.

## Cast (public information only)

| Name | Role | What everyone knows | Voice note |
|---|---|---|---|
| Ms. Amara Penrose (helper, not a suspect) | Head librarian, 50 | Runs the sleepover. At seven, in front of everyone, she locked the book in its case and hung the little brass key on its hook behind the front desk. Keeps a pair of white cotton gloves on the front desk, for touching the old book. Wears reading glasses on a beaded chain. | Warm and quick; whispers out of habit, then remembers she doesn't have to |
| Mr. Ambrose Thistlewood | Retired teacher and sleepover storyteller, 78 | Reads the bedtime stories, wearing reading glasses on the end of his nose. Says The Clockwork Fox was his favourite book when he was a boy. | Slow and gentle, with a soft Scottish burr; says "dearie me" |
| Felix Dunmore | Night caretaker, 40 | Carries a jangling ring of keys and wears big rubber boots. Grumbles that the glass case is "more trouble than it's worth," because he has to polish it every day. | Gruff and short, but kind underneath; says "right then" |
| Priya Lindqvist | Teen volunteer, 15 | Takes photos for the library newsletter and never puts her camera down. Wears bright sneakers. Was heard saying, "I have to get that book out of the case tonight." | Fast and excited; says "literally" |

## Who was where, 8:00–8:30 (as each person tells it)

This is what each person will say. Use it whenever anyone is asked where they were. It is their account, not necessarily the truth.

| Person | Their account |
|---|---|
| Ms. Penrose | In the Craft Room serving cocoa for the whole break, 8:00 to 8:20, with all the kids; she counted heads twice. Priya came in at about quarter past and stayed. At 8:20 she took everyone back to the Story Corner and told riddles while they waited for Mr. Thistlewood. |
| Mr. Thistlewood | (This is his fib.) "I went to the staff room to rest my voice for the whole break, and I dozed off on the couch. That's why I was late back." He came back to the Story Corner at about 8:25. |
| Felix | Mopped the front hall from 8:00 to 8:10, finishing right around the glass case. Ate his sandwich in the staff room from 8:10 to 8:20: "Nobody came in except Priya, snapping her camera, and the couch was empty." At 8:20 he went to the Story Corner and changed the batteries in the big lantern while all the kids watched. |
| Priya | At seven she asked Ms. Penrose for the case key, to photograph the book's first page for the newsletter, and was told no. During the break she took newsletter photos around the library: the glass case, then straight on down the back corridor to the staff room. She joined the cocoa in the Craft Room at about quarter past, kicked off her sneakers to sit on her sleeping bag, and went to the Story Corner with everyone at 8:20. |
| You (the player) | In the Craft Room with Ms. Penrose and the other kids for the whole break. |

## Chapter 1 — The book that wasn't there (≈20 min)

### Scene 1.1 — The front hall
**Read aloud:** The glass case stands in the front hall, on a wooden stand with a little brass lock. The lid is shut, but the velvet cushion inside is empty. The floor around it is shiny under the night lights.
**Available:** the glass case and its lid, the velvet cushion, the floor, the front desk, the key hook behind the front desk, the spiral stair up to the Reading Loft, Ms. Penrose.
**Clues here:**
- The case is shut but not locked. The little brass key is back on its hook behind the front desk, so whoever opened the case put the key back.
- The front desk: the tray where the white cotton gloves always sit is empty. If asked, Ms. Penrose says: "The white gloves for the old book were right here at seven."
- The floor (not hidden, but mention it only when the player looks at the floor): one smudged footprint on the mopped floor right in front of the case, made while the floor was still damp. It is a big, grown-up-sized print, and its bottom is perfectly smooth, with no bumps, stars or zigzags at all, like a soft, smooth sole.
- *hidden* (player looks closely at the lid, the latch or the lock): a tiny white cotton thread is caught on the latch, like one from a glove.
**Leads to:** 1.2, 1.3

### Scene 1.2 — The Craft Room
**Read aloud:** The Craft Room is full of sleeping bags, paper lanterns and mugs of cocoa. Mr. Thistlewood, Felix and Priya are all here, looking worried, and Ms. Penrose is counting the kids again. Who do you want to talk to?
**Available:** question anyone (see GM instructions); look at anyone; look at Priya's camera (only if the player asks to, or she offers in lead 2).
**Public facts they volunteer:**
- Ms. Penrose locked the book in the case at seven, in front of everyone, and hung the key on its hook. Everyone saw where it went.
- The front doors have been locked from the inside since seven. Nobody has come in or gone out.
- Ms. Penrose and all the kids were in the Craft Room for the whole break, 8:00 to 8:20.
- Mr. Thistlewood was late back to the Story Corner, at about 8:25. Ms. Penrose adds: "He told the second half of the story from memory tonight, instead of reading it from the book."
- Ms. Penrose noticed the empty case at 8:30, when she walked the kids past it to brush their teeth.
**Clues here:**
- Shoes (not hidden, but mention them only when the player looks at people's shoes or feet): Felix's rubber boots have deep zigzag ridges on the bottom. Priya is in her socks (she took her sneakers off when she sat down for cocoa); her sneakers sit by her sleeping bag, with chunky little stars on the bottom. Mr. Thistlewood is wearing soft tartan slippers with smooth bottoms. Ms. Penrose's shoes have ridged rubber bottoms; the kids are all in socks.
- Priya's camera (she shows it happily when asked): a photo at 8:12 of the glass case with the book still inside on its cushion, and the floor shiny and empty; a photo at 8:15 of the staff room, with Felix eating his sandwich and nobody else there, the couch empty; a photo at 8:17 of kids drinking cocoa. There is no photo of the book open. Priya sighs: "I never got my picture of the first page."
**Leads to:** 1.3, 1.4, 1.5

### Scene 1.3 — The Reading Loft
**Read aloud:** At the top of the creaky spiral stair is a cosy little loft, with a big squashy armchair and a glowing reading lamp. Next to the armchair is a little round table. Someone was sitting here not long ago.
**Available:** the reading lamp, the armchair, the armchair cushion, the little round table, the bookshelves (ordinary library books, nothing of note), the window seat (nothing of note).
**Clues here:**
- The lamp is on. If asked, Ms. Penrose says she switched it off herself at seven.
- On the little round table: a pair of reading glasses, and one white cotton glove. If the player checks, Ms. Penrose's own glasses are still on their chain round her neck.
- *hidden* (player looks under or behind the armchair cushion, or searches the armchair): The Clockwork Fox, safe and sound, with a paper bookmark at the very last chapter, "The Fox Comes Home." The other glove is not here.
**Leads to:** 1.4, 1.5

### Scene 1.4 — The staff room
**Read aloud:** The staff room has a kettle, a little table and a saggy couch. Felix's lunchbox sits on the table with a few sandwich crusts inside. The couch cushions are flat and neat, as if nobody has sat there for ages.
**Available:** the kettle, the table, Felix's lunchbox, the couch. Nothing else is here.
**Clues here:** nothing hidden. If the player asks Felix about the couch, he says: "I was in here from ten past to twenty past, right then. Only Priya popped in with her camera, and that couch was empty the whole time."
**Leads to:** 1.5

### Scene 1.5 — Show and tell
**Read aloud:** Everyone is back in the Craft Room, and Ms. Penrose says it's time to put the clues together. The grown-ups are looking at each other, and Priya is chewing her lip. Who do you want to show a clue to?
**Available:** show anyone a clue; showing a clue unlocks that person's answer below. The player may accuse at any time.
**What showing a clue yields:**
- **Felix** (shown the footprint, or asked about his keys): lifts one big boot to show the zigzag bottom. "Right then, does that look smooth to you? And there's no little brass key on my ring; that one lives on the hook."
- **Priya** (shown the footprint, the photos, or asked about "getting the book out"): "I meant for a photo! I only wanted a picture of the first page, and look, I never got one." She holds up a sneaker to show the stars, and says she only took them off when she sat down for cocoa, with everybody watching.
- **Mr. Thistlewood** (shown the glasses, the glove, the footprint, or Felix's empty couch): pats his pockets. "Dearie me, I may have wandered up for a quiet sit." He says nothing more until the accusation.
- **Ms. Penrose** (asked about any clue): answers anything this file covers, but never guesses who did it: "That's for you to work out, detective."
**Leads to:** Endings

### Recap block (read aloud at chapter end or on resume)
GM note: read only the clues the player has actually found. Fill the template; keep it to four sentences or fewer.

"So far: the very first copy of The Clockwork Fox vanished from its glass case during the cocoa break at the library sleepover. You have found <the clues found so far, in a short list>. You still haven't worked out <the open question: who opened the case, and where the book went>. When you're ready, say 'Plot Speaks, resume' and tell me what you want to do next."

## Endings

- **The verdict.** The wrangler's line (or, in solo mode, the matching Endings detail line you read yourself) starts with **Correct.** or **Innocent.** Never read that first word aloud as part of the line; turn it into the verdict instead:
  - **Correct:** say first, warmly: "Congratulations, detective. You've solved it." Then the rest of the line, then the correct-accusation ending below.
  - **Innocent:** say first, gently: "I'm sorry. You've accused an innocent person." Then the rest of the line, then the wrong-accusation ending below.

- **Correct accusation:** after the wrangler reads the confirmation, read aloud: "Ms. Penrose fetches the book, and everyone gathers on the rug by the big lantern. Mr. Thistlewood puts on his reading glasses and reads the very last chapter aloud to the whole sleepover, and tomorrow morning the book goes safely back behind its glass. Would you like to hear how the story of the clockwork fox ends?" If yes, say in one or two sentences that the little fox finds her way home at last, and everyone goes to sleep smiling.
- **Wrong accusation:** the accused answers kindly with the fact that clears them, as the wrangler reads it. Then the person named in the next unfound lead on the "Keeping it moving" list gives that lead, in one sentence. Then ask: "Do you want one more try, or the full reveal?"
- **Out of time** (the player says "Plot Speaks, wrap it up" or asks to wrap up; or the player has been asked who took the book and twice declined): read the recap block, then: "Ms. Penrose is dimming the lights for bedtime. If you had to name someone right now, who would it be?" Resolve as above.