Mortimer Brewster is a newspaperman and author known for his diatribes against marriage. We watch him being married at city hall in the opening scene. Now all that is required is a quick trip home to tell Mortimer's two maiden aunts. While trying to break the news, he finds out his aunts' hobby; killing lonely old men and burying them in the cellar. It gets worse.

The defense and the prosecution have rested, and the jury is filing into the jury room to decide if a young man is guilty or innocent of murdering his father. What begins as an open-and-shut case of murder soon becomes a detective story that presents a succession of clues creating doubt, and a mini-drama of each of the jurors' prejudices and preconceptions about the trial, the accused, AND each other. Based on the play, all of the action takes place on the stage of the jury room.

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