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A young woman called Lucy Crale is living overseas and receives an old letter that her mother Caroline wrote to her from prison, shortly before she died while serving a life sentence for the murder of Lucy's father, the artist Amyas Crale. Amyas was killed sixteen years before, and at the time it seemed like an open and shut case, but in her letter Caroline tells Lucy she didn't do it, so Lucy travels to London and hires Poirot to solve the case.
Poirot finds that Amyas was a notorious womanizer and begins by investigating his love life.
Based on Agatha Christie's whodunnit, Five Little Pigs (1942).
Carla Crale in the book has become Lucy Crale in this production.
Poirot: It is surprising, is it not, how soon in life the die is cast?
Lucy Crale: Secrets and lies, monsieur. The past keeps on dragging me back.