The Gala Murder
Someone at the gala is lying about where they were when the lights went out. The body is still warm, the doors are locked, and every guest had a reason.
The AI Murder Mystery Game Where You're the Detective
Someone in this story is lying to you, and the Storyteller knows exactly who. Tell Runebook the mystery you want: a poisoning at the gala, a witness who vanished, a case closed twenty years too soon. Then step in as the detective everyone lies to.
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Stories you can step into
Somebody in every one of these cases is lying to you. The nine below are mysteries you can step into today. Start from one, or describe your own: a sleeper train in 1923, a vineyard wedding, a victim you knew personally. The setting is yours.
The Missing Heiress
She was last seen boarding the night ferry. She'd paid her landlady three months ahead. Nobody pays ahead and then disappears unless they knew something was coming.
The Cold Case
The file has been closed for twenty years. Then a letter arrives in the victim's handwriting.
The Blackmail Web
Half the town is paying someone to stay quiet. Find the blackmailer and you learn every secret in the parish, including the one that gets people killed.
The Impostor
The heir came back from the war a different man. His own dog growls at him. You're the only one who noticed his signature slants the wrong way.
The Wrong Suspect
They found the knife in your friend's coat. The evidence is perfect. Too perfect. The trial starts in three days.
The Cover-Up
The report says accident. The coroner's hands say terror. Someone powerful wants this case to stay closed, and they know you've been asking questions.
The Last Witness
She testifies in the morning. Your job is to keep her alive until then. Someone in the safehouse keeps checking the street.
The Secret Society
The invitation carries a seal no one has used in a century. Learn the passphrase. Wear the mask. Don't let them discover you were never invited.
Start from a case, or tell the Storyteller your own. New ready-to-play stories are being added.
Mystery is memory under pressure
A mystery is only as good as its consistency. Ask a chatbot who the killer is and it decides on the spot. Ask again tomorrow and it decides differently. That isn't a mystery. That's a chatbot wearing a costume.
In Runebook, the mystery holds together. The killer isn't improvised when you finally point your finger; the killer has been there all along, leaving the trail you've been stepping over. Clues stay consistent from the first chapter to the accusation, which is what makes deduction worth doing.
That's why interrogations work here. Suspects keep their stories straight because the Storyteller remembers the alibis you've heard and the contradictions you've caught. The maid who said she was in the kitchen is still saying it in chapter six. And when a story changes, you'll notice.
The world didn't just save your progress. It kept the receipt. The cigarette case you pocketed in chapter two is still in your coat when you need to rattle a suspect in chapter nine. One scene later, your questions are choices. Ten scenes later, they are history.
How it works
Say what mystery you want
Type it the way you'd say it: "A murder at a lighthouse, 1890s. I'm the detective nobody in town trusts." The Storyteller builds the world, the cast, and the crime, then hands you the case.
Investigate your way
Tap one of the Storyteller's suggestions, or write your own move. Search the study. Ask the widow why the window was open. Lie to the constable. You can even say your move out loud.
The story remembers
The story carries forward what you actually did: the suspect you rattled, the lie you let slide, the promise you made to the widow. Secrets surface at the moment they hurt most. And the world moves even when you hesitate: stall too long, and the next witness stops talking.
An AI detective game where the suspects push back
Most detective games hand you a magnifying glass and a list of hotspots. Runebook hands you people. The suspects in your story have moods, secrets, and memories of you. Lean on the dockworker too hard and he clams up, then tells the others you're trouble. Earn the barmaid's trust and she tells you what she really saw. The people you've met remember what you did, and they act on it.
And there's no script protecting you. Bluff that you have evidence you don't, and fate gets a say at pivotal moments: sometimes the bluff lands, sometimes it costs you the room. Drama is what changes because you said it.
Games where you are the detective, not the audience
In most whodunits, you watch the detective work. You tap the dialogue forward and wait for the author's reveal. In Runebook, no one solves anything until you do. You decide which thread to pull, who to confront, and when to make the accusation. There's no scene you're required to find and no order you're supposed to follow. The Storyteller writes each beat around the move you actually made.
And the accusation is yours too. Name the wrong person and the story doesn't rewind. An innocent reputation breaks, the real killer breathes easier, and the town starts doubting you. The case is still open, and now it's personal.
Solve a murder mystery with AI, alone or with friends
Solo, your case reads like a detective novel, literally. Novel Mode lays your investigation out as typeset pages, with scene images woven into the prose and chapter headings as the case deepens. Turn on narration and hear your story told, word by word as the text lights up, with character voices for the suspects you grill.
Or run the case with friends. A private story puts your whole group inside one investigation, arguing over suspects in party voice chat while the Storyteller keeps the alibis straight. It's murder-mystery night without the envelopes, and nobody gets stuck playing the butler.
Either way, it plays in your browser on phone, tablet, or desktop. No download.
Questions, answered
What is an AI murder mystery game?
An AI murder mystery game is an interactive story where an AI Storyteller runs the case and you play the detective: an AI whodunit where you do the solving. Instead of tapping through scenes an author wrote in advance, you direct the investigation: you interrogate suspects, search rooms, and follow whichever thread you choose, and the Storyteller carries each scene forward from what you actually do. In Runebook, somebody in the story is lying to you. The clues add up to something real. Your job is to catch them at it.
Can the AI keep the mystery consistent?
Yes. That's the point of Runebook. The mystery holds together: the killer isn't being invented as you go, and the Storyteller remembers your story as it unfolds, including who told you what, which alibis you've heard, what you found and where you found it. Suspects keep their stories straight from chapter to chapter, and when a detail does shift, it's a thread worth pulling. The clue you found in the first chapter still counts when you make the accusation.
Do I choose from options or can I ask anything?
Both. The Storyteller offers choices you can tap, which is handy when you want momentum. But you can always type your own move instead, and it can be anything: a question nobody suggested, a bluff, a search of a room no one mentioned. You can even speak your move out loud. The story responds to what you actually said, not to a menu.
Is the killer decided in advance, or made up as I play?
The killer doesn't change to match your guesses. You can't shake a different confession loose by accusing twice. The clues you find point at something real, which means deduction actually works: you can be genuinely right or genuinely wrong. And every case is its own story, so a similar setup can end with a different killer entirely.
What happens if I accuse the wrong person?
The story keeps going, and it remembers. An innocent person's life gets worse, the real killer relaxes, and your word loses weight around town. Runebook doesn't block your mistakes and doesn't undo them; it folds them into what happens next. Some of the best cases begin with getting it wrong.
Do I need to be good at mystery games?
No. There are no rules to learn, no puzzle gates, no hunting for the one hotspot on the screen. If you can ask a question, you can play. When you try something genuinely risky, like bluffing a dangerous man or slipping through a locked door, fate gets a say at pivotal moments, and whichever way it goes becomes part of your story.
Can I play with friends?
Yes. You can run a private story where your whole group shares one investigation, talk it through in party voice chat, and let others watch as spectators. Solo play is just as central; most detectives work alone.
What do I need to play?
A browser. Runebook plays on your phone, tablet, or desktop with no download and no install. Your story is saved as you go, so you can leave a case on your laptop at midnight and pick it up on your phone at lunch.
Does it read the story aloud?
Yes. Voice narration reads your story as it happens, with each word highlighted as it's spoken and distinct character voices for the people in your case. You can listen like an audiobook of your own investigation, or read in quiet, with Novel Mode laying your story out like a typeset detective novel, scene images set into the prose.
When can I play?
Runebook is in Early Access. Custom stories, including mysteries in any setting you can describe, are live today, and new ready-to-play stories are being added. Leave your email below and you'll be first in line when new stories open.
More stories to step into
Or start at the beginning: Runebook is the AI story game where you're the main character.
