Lee Griffin is an actor who is reunited with his old girlfriend Diana at a London production of a play being financed by Diana's husband Charles Justin. Lee and Diana rekindle their old romance and hatch a plot to kill her husband who is a wealthy diamond merchant. Lee's first attempt to kill Charles fails, but he succeeds on his second try. On a trip to Paris, Lee assumes Charles's identity. Unfortunately, Charles was aware of Diana's unfaithfulness and murderer her before he was killed. He hid her body in a car which is being shipped to Paris. Customs officials find the body and Lee, who is posing as Charles, is arrested for the crime.