Mr. Boddy acts as host as he invites the audience to play "The Game" while introducing each of the other characters. He then brings three audience members onstage to choose one card each from one of three stacks, representing six suspects, six rooms, and six weapons. These selected cards, unseen by the selectors, cast, or the audience, are placed in an oversized envelope marked "Confidential", which is displayed on stage for the duration of the musical and opened to reveal the cards near the end. Mr. Boddy instructs the audience on how to play along. Between scenes throughout the musical, Mr. Boddy gives rhyming clues, which provide the audience with information they may jot down on a form supplied to them and use to solve the mystery.