A dramatic society is assembling on the stage of a church hall to rehearse a mystery thriller under its somewhat dictatorial director Philip Stephens. Events and strains within the company more than equal those in the play. Philip's wife is too friendly with a young man of the company, a prowler is in the neighborhood and attacks one of the girls, an unpleasant caretaker tries a little blackmail and one of the women seems to know him from the past. The rehearsal proceeds under difficulties until the mysterious death of the caretaker brings the situation of the whodunit even more closely into real life. It transpires that almost everyone might, and could, have murdered the dead man.