Ask a stage actor how much to rehearse and the answer will be “more”. Ask someone who has hosted a few murder mystery parties, and you will hear something closer to “less than you think”. That is largely because of one happy quirk of our games: the host usually doesn’t know who did it.
This changes what rehearsal is for. You have no plot to memorise, no alibi to keep straight and no secret to guard with a poker face. The guests hold the mystery between them, and your job is to keep the evening moving. So the preparation you need is practical and fairly modest, and how much of it depends on which hat you plan to wear.
If You Are Using the MP3s
When the Inspector arrives by recording, you are effectively the stage manager, and stage managers are rarely asked to perform. An hour is plenty. Read the host guide once, all the way through, with a cup of tea nearby. Lay out your materials in the order you will need them, so you are not hunting through a pile of paper while a guest asks whether the soup is meant to be this colour.
The one thing worth testing properly is the audio. Play the files on the actual speaker you will use, in the actual room, at a volume that will carry over a table of chatting guests. Check that the files have downloaded and that the speaker pairs with your phone without a fuss. A Bluetooth connection that sulks at the crucial moment has ruined more dramatic reveals than any clever murderer.
If You Are Playing the Inspector
Here a little more effort pays off, because the Inspector sets the tone for the whole night. Read each script aloud at least once, ideally standing up, since a speech that looks fine on paper can sound very different in the mouth. Mark the places where you want to pause, and note any line that needs a raised eyebrow. Then stop. A script read too many times starts to sound recited, and an Inspector who sounds as though they are reading a shopping list loses the room quickly.
Since you don't know the solution, you also have to choose the final reveal. Check your host guide to see which parts of the Inspector material are safe to read ahead of time and which give the game away. If you would like to be surprised along with your guests, rehearse everything except the closing statement and read that cold on the night, perhaps after a glance to find your place. Guests tend to enjoy watching the host’s face as the truth comes out, and genuine astonishment is difficult to fake.
If You Have a Character
Read your own character sheet twice. The first read gives you the story, and the second lets you pick out one or two details to lean on, such as a grudge, a habit or an unfortunate hobby. Decide how your character sounds, and perhaps choose a small prop. That is enough.
Do not read the other characters’ sheets. They belong to your guests, and reading them would spoil the one thing that makes you a proper participant rather than a referee. You also do not need to be word perfect. Half the table will be glancing at their own paper, and a mystery night is a very forgiving audience.
The Rehearsal That Earns Its Keep
The most useful preparation has little to do with performance. Walk through the evening in your head, from the arrival drinks through each round to the final accusations, and work out where the food fits. Dinner party games reward a host who knows when the main course lands relative to the next round, because a mystery paused for a collapsing soufflé loses momentum.
Do this reading the day before rather than an hour before the doorbell rings. A calm host who has glanced through the guide with a clear head will cope with nearly anything a party throws up, from a late arrival to a guest who confesses to everything in the first five minutes.
As a rough guide, allow about an hour for a host using the MP3s and perhaps ninety minutes for a host who is also the Inspector, with a little extra if you are taking a character as well. Beyond that, you are polishing something that was already shiny, and your time is better spent on the canapés.
A relaxed host who occasionally loses their place will always beat a polished one who looks as though they are sitting an exam. Your guests came to be entertained and to accuse each other of terrible things. Give them the table, the clues and a reasonably confident Inspector, and they will do the rest.
