Overview
Tony Wendice, who married his wife Margot for her money, now plans to murder her for the same reason. Tony arranges the perfect murder: He hires a scoundrel he once knew into strangling Margot, and arranges a brilliant alibi for himself. The night of the planned attack, in a thrilling surprise twist, the plan goes awry and Margot manages to kill her attacker.
Momentarily ruffled, Tony soon sees the hitman's death as an opportunity to have his wife convicted of murder. Working with an inspector from Scotland Yard, Tony plants the idea that Margot had planned the murder. Fortunately, the inspector and a friend of Margot's eventually discover the truth. In a scene of almost unbearable suspense, they trick Tony into revealing his guilt, freeing Margot.