A murder mystery party has one job: make a room full of people talk to each other with purpose for two hours. Get the structure right and it runs itself. Get it wrong and you spend the night explaining rules while your guests check their phones.
This is the whole process, in the order you will actually do it. We make Sleuth Night, a phone-based murder mystery kit, so we have opinions about kits. Everything else here applies whatever you use.
1. Decide what kind of party it is
There are three formats, and picking the wrong one is the most common mistake.
| Format | How it works | Best for |
|---|---|---|
| Scripted | Every guest reads lines from a booklet in order. | Groups that want zero improvisation. Feels like a table read. |
| Structured improv | Each guest has a character, a secret and round-by-round objectives. They talk freely; the host advances rounds and reveals clues. | Most adult parties. This is what people mean by “murder mystery party”. |
| Hosted whodunit | The host is the detective and knows the answer; guests are suspects or investigators. | Kids’ parties and team events with a facilitator. |
The rest of this guide assumes structured improv, because it is the format that works for a normal group of friends. You do not need actors. You need people who will read one paragraph before they arrive.
2. Pick the player count first, then the kit
Count your guests honestly, then add the two who will cancel and the one who will bring someone. Then pick a kit that fits the range, not the exact number.
- 6 players is the floor. Below that, everyone is interrogated constantly and the murderer has nowhere to hide.
- 8 to 12 is where it sings. Enough suspects for red herrings, few enough that everyone gets talk time.
- 14 to 16 is a production. Fun, but you will want a co-host and a room people can spread out in.
The important feature in a kit is optional characters. A good mystery has a core cast the story needs and extra characters that can drop in or out. That is what lets you set the count on the night instead of the week before. Sleuth Night mysteries have six core characters and up to ten optional ones; we have pages for 6, 8, 10, 12, 14 and 16 players that show exactly who is in the cast at each size.
3. Choose a theme your guests can dress for
Theme is mostly a costume decision. The mystery is the same game whether it is set in a speakeasy or a space station; what changes is whether your guests can put together a costume from what they own.
Safe themes: 1920s (a hat, pearls, braces), Halloween gothic (black anything), Christmas (a sweater), masquerade (a mask). Risky themes: anything requiring a specific outfit nobody has.
Costumes by theme, from what people already own
- 1920s. Men: white shirt, braces or a waistcoat, a flat cap or fedora. Women: a straight dress, pearls, a headband with a feather. Everyone: a cigarette holder, unlit.
- Gothic manor. Black clothes, a candle-lit face. Add a shawl, a cravat, a veil, gloves. The doctor gets a bag; the medium gets a scarf.
- Christmas lodge. The sweater is the costume. Add a Santa hat for the host, an apron for the cook, a briefcase for the lawyer.
- Masquerade. Black tie and a mask. The mask comes off after round one so people can eat.
Tell guests the two items on the invitation and leave it there. A costume bowl by the door covers everyone who ignored it.
We have a full guide to murder mystery party themes and, if you are stuck for the shape of the night, murder mystery party ideas.
4. Pick a kit: PDF, box, or phone
This is where the printing happens or does not.
PDF kits (Etsy, most download sites) are cheap and there are hundreds. You print 30 to 60 pages, cut them, sort them into envelopes by character and by round, and hand them out on the night. Budget an evening for the prep. You will also be the person reading the rules aloud.
Boxed kits arrive in the post with everything printed. Nicer paper, fixed player count, and you are still reading aloud from a booklet.
Phone-based kits send each guest a private link. They read their character before the party, and on the night each round's objectives and clues appear on their phone when the host advances the round. Clues go on the TV. The vote happens on phones. Nothing is printed and nobody reads rules aloud.
What it costs
A murder mystery party costs about the same as a normal dinner party plus the kit.
| Item | Typical cost |
|---|---|
| PDF kit | $10 to $40, plus an evening of printing and cutting |
| Boxed kit | $30 to $70, fixed player count, shipping time |
| Phone-based kit (Sleuth Night) | $29 per party, free to set up, host again for free |
| Name tags, props, candles | Under $15 if you buy anything at all |
| Food and drink | Whatever you would spend on dinner for the same people |
The kit is the smallest line. The expensive part is always the food, so plan the menu before you agonise over which mystery.
Whatever you choose, check three things: does it scale to your player count, does the host get to play, and does the murderer know they are the murderer from the start (they should; a murderer who finds out at the reveal cannot lie convincingly all night).
5. Send invitations two weeks out, characters two days out
Two separate messages.
The invitation goes out two weeks before: date, time, theme, dress code, and the one sentence that makes people say yes. “It’s a murder mystery. You’ll get a character. Someone at dinner is a killer.” Ask for a firm RSVP by a date, because the player count matters.
The character goes out two days before: their name, their public bio, their secret, and their costume hint. Two days is long enough to find a hat and short enough that they remember it. If your kit sends links, this is when you send them. If it is paper, this is an email with the character page attached.
Invitation wording that gets RSVPs
Keep it to five lines. Here is one that works for a 1920s party:
You are invited to The Velvet Hour. Chicago, 1927. Saturday 18 October, 7pm, at ours. It’s a murder mystery: you’ll get a character two days before, and someone at the table is a killer. Dress 1920s (a hat and something that sparkles is enough). Password at the door: Swordfish. RSVP by the 4th so we can cast you.
The two things that matter are the RSVP deadline with a reason (“so we can cast you”) and the costume brief being two items. Our Party Pack (a $9 add-on at checkout) has printable invitations for each of our mysteries if you prefer paper.
Do not send the full rules. Guests will not read them, and a good kit tells them what to do round by round anyway.
6. Cast the characters on purpose
Do not assign randomly. Match people to roles:
- The most confident guest gets the character with the most to hide. They will enjoy lying.
- The quietest guest gets a character with clear, simple objectives and a secret that other people will come looking for. This gives them a reason to be approached.
- Couples should not play characters who are married in the story. Split them up; it makes both of them talk to more people.
- The host plays a normal character. Do not make yourself the detective unless your kit needs one.
- Your last optional character stays unassigned until the day before, for the plus-one.
Read every character's blurb before you assign. Five minutes of casting is the difference between a good night and a great one.
7. Plan the food around the rounds
The game has a natural three-part structure, and dinner has three courses. Use it.
- Arrival, drinks, round one. Guests are introducing themselves in character. Finger food, standing up.
- Main course, round two. The first clues are out. Seat people next to the characters they need to talk to (their objectives will tell you).
- Clear the plates, round three, vote, reveal, dessert. Accusations while the plates are cleared; dessert after the killer is revealed.
If you are not doing a sit-down dinner, a buffet works better than plated food for anything over eight people. Our Party Pack (a $9 add-on to any mystery) has themed playlists and a décor checklist per mystery; the murder mystery party food ideas guide has menus by theme.
8. Set up the room
You need three things: somewhere everyone can hear the host, somewhere two people can talk privately, and a screen.
- The screen. A TV or laptop that shows the current clue. Without one, the host reads clues aloud and half the room misses them. Phone-based kits give you a screen link; for paper kits, tape the clue to a wall where everyone can see it.
- A private corner. A hallway, a kitchen, a balcony. Half the game is two people stepping away to compare notes.
- Lighting. Lower than usual. It does more for the mood than any decoration.
Name tags matter more than you think. Character names, not real ones, big enough to read across the room.
9. Run the night: the host's script
This is what you actually say and do. It takes less effort than hosting a normal dinner, because the structure carries the conversation.
Before you start (10 minutes). Get everyone a drink. Confirm everyone has read their character. Check the player count matches who turned up; if someone cancelled, drop their optional character now.
Press Start. Round one (20 minutes). Read the round intro aloud, or let the screen do it. It tells the room the victim is dead and that everyone is a suspect. Guests introduce themselves in character and find out who else is in the room. Their round-one objectives tell them who to talk to.
Round two (20 minutes). Advance the round. New clues on the screen; new objectives on each phone or in each envelope. This is where secrets start to leak. Circulate and eavesdrop; you are also a suspect.
Round three (20 minutes). Advance the round. The final clues. Objectives now say “find out who did it”. Let it get loud.
The vote (5 minutes). Everyone votes for who they think the murderer is. On phones, or on slips of paper in a bowl. Do not let people confer.
The reveal (5 minutes). Show the result, then the solution. If your kit has per-character epilogues, read them; they are the best part. Then hand out awards if you have them: best detective, best liar, best costume.
Set timers and be strict about them. Every round runs long if you let it, and the night is better when people are still talking about a clue when the next round starts.
If something goes wrong on the night
- Two guests cancel an hour before. Drop their optional characters. In Sleuth Night you change the player count on the dashboard and the cast updates; in a paper kit, remove the envelopes and tell the room those characters “left early”.
- Someone arrives in round two. Give them the spare optional character and a one-line summary of what has happened. They will catch up in ten minutes; everyone will want to interrogate the newcomer.
- A guest has not read their character. Give them five minutes on the sofa with their phone while everyone else gets drinks. Do not start until they have.
- The murderer has told someone. It happens once a year. Carry on; the vote will be lopsided, and the reveal still works because nobody knows the how.
- The room has gone quiet. Advance the round. New objectives restart every conversation.
- The TV will not connect. Open the screen link on a laptop and put it on the table, or read the clue aloud twice and leave the phone showing it on the table.
10. Mistakes that ruin the night
- Explaining the rules aloud. Nobody listens. Give each guest what they need when they need it.
- Too many players for the kit. A 10-player mystery with 14 people means four guests with nothing to do. Use a kit with optional characters.
- Letting the murderer find out at the reveal. They need to know from the start.
- No screen. Clues read aloud once are forgotten. Put them where everyone can see them all round.
- The host as referee. Play a character. The dashboard, or the envelopes, tell the room what to do.
- Starting late. Guests arrive 30 minutes apart. Set a hard start time for the game, 45 minutes after the invitation time, and start without stragglers. They can pick up their character on arrival.
Checklist
Two weeks out: pick the kit, send invitations with theme and dress code, ask for RSVPs.
One week out: confirm numbers, choose the mystery, cast the characters.
Two days out: send characters. Buy props for the “forgot a costume” bowl.
The day: screen set up, name tags, lighting, timer, food planned around three rounds.
The night: drink, start, three rounds, vote, reveal, awards.
If your party is a specific occasion, we have pages on hosting a murder mystery for Halloween, Christmas, a birthday, a bachelorette, team building, over Zoom and for teens. New to the format? Read how a murder mystery game is played.