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Sixteen years ago, Caroline Creil was convicted of the murder of her husband, the artist Amyas Creil. But Caroline's daughter, Carla Lemarchand, does not believe her mother is guilty. In an effort to restore her good name, the girl turns to the famous Hercule Poirot for help.

The detective soon finds out that there were five other people in the Krail household at the time of the murder: Amyas's friend, who came to visit the artist with his older brother, a girl model, as well as Caroline's foster sister and her governess.

Poiro is sure that the killer is one of these five. But who exactly? To find the culprit, the detective will have to travel back in time...

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