Ex-tennis pro Tony Wendice wants to have his wealthy wife, Margot, murdered so he can get his hands on her inheritance. When he discovers her affair with Mark Halliday, he comes up with the perfect plan to kill her. He blackmails an old acquaintance into carrying out the murder, but the carefully-orchestrated set-up goes awry, and Margot stays alive. When she turns the tables on her attempted assailant, she is convicted of murder. Can the police detective who brought her to trial now decipher the clues that will save her life? The play that inspired Hitchcock’s suspense classic weaves an ever tightening web of danger and deception.