The Guest Book, 21:00 | Japanese-Style Murder Mystery for 3-6 Players + Host | Printable PDF | 90-120 min

THE GUEST BOOK, 21:00 — a Japanese-style murder mystery for 3–6 players and 1 host. 90–120 minutes. Printable PDF.

A small hot-spring inn, high in the mountains. A main house, and three detached rooms out in the garden. That is all of it.

Tonight there is one guest. Toichi Kajitani, seventy-four. For twenty years he has come on the same date, to the same room. Twenty entries in the guest book, all on the same line, all in the same hand. This year, at the end of his entry, he has added four words: “This is the last one.”

At 15:00 a landslide closed the only road. The phone line went down with it, and there was never any mobile signal up here. That leaves three people in the inn with him: the young proprietress, an editor who came up from Tokyo for his memoir, and the bath keeper who has looked after the water for forty years.

At 21:30 he is found dead in the private bath of his room.

Twenty years ago, a man died in the bath house of this inn as well. The owner. Her father. It was written up as an accident.

The road reopens at 06:00. One bus. Eight and a half hours.

There is no vote in this game

In most murder mysteries everyone votes at the end to name the killer. Not here. Here you decide who gets on the bus.

• The three of you talk, and choose one person to go
• You may nominate yourself
• “Nobody goes” is a legitimate choice
• It has to be unanimous. One objection and it does not happen

If 06:00 arrives with no agreement, the bus leaves empty. That is not a failure. It is one of the proper endings.

This is not an ending where you catch a killer. What you are deciding is who gets to leave. Someone at the table wants an accusation, someone wants a person to get away, and someone wants to stay. The three goals do not fit together to begin with. There is exactly one narrow path on which all three can agree.

WHY IT WORKS AS A CLASSROOM ACTIVITY

• Close reading with stakes. Every clue is a document students have to read carefully. Missing one detail changes who they accuse.
• Evidence-based argument. Players make a claim, cite the document it came from, and defend it against the other readings at the table.
• Structured discussion. Fixed phases — reading, discussion, investigation, final discussion, resolution — so the conversation does not drift.
• No preparation beyond printing. The host script is written to be read from the top. No rules to adjudicate, no dice, no components to assemble.

HOW THIS DIFFERS FROM A MURDER MYSTERY PARTY KIT

If you have run a boxed “murder mystery dinner” before, this is a different genre. Please read this before buying.

• The host does not play. They run the game. That is what lets the story hide information the way it does.
• Each player gets a private booklet with a secret only they know, and two goals — one shared with the table, one private.
• The culprit is a player, not the host, with their own goals to pursue.
• Single use. Once a group knows the answer they cannot play it again — but you can run it for new groups as often as you like.

WHAT YOU GET (8 files, 7 of them PDF)

A read-me for everyone, a host script with the full running order and read-aloud text, the evidence set, one private booklet per character, and a plain-text version you can paste into a video call or a shared document.

WHAT YOU NEED

3–6 players plus one host, 90–120 minutes, and either a printer or a shared screen. First-time hosts can run this. Everything prints in black and white on ordinary paper.

LICENSE

Classroom and club use is fine, including running it for as many groups as you like. Streaming and let’s-plays are allowed, monetized or not. Please do not redistribute or resell the files, claim authorship, or post the solution publicly.

HOW THIS WAS MADE

This scenario was written with the assistance of an AI language model (Claude, by Anthropic), then edited, structured, and consistency-checked by a human before release. The plot, characters, clue structure, and all text were reviewed by the maker.

Ai-Q Labs makes murder mysteries in which all the evidence is text — a corrected page proof, a radio log, a weather record. Check out Ai-Q Labs for the rest of the series.