Elinor Carlisle has been accused of killing her wealthy Aunt and a rival in love. When Poirot comes to the case he quickly finds motive, opportunity and means for Elinor to have done the double murder. But a tidy package is not enough to satisfy Poirot's curiosity, and he eventually pieces together an entirely different picture of what really happened in a case that appeared to cut and dried.

Based on the novel by Agatha Christie.