Carla Lemarchant asks Poirot to investigate the murder of her father, the painter Amyas Crale, for which her mother was convicted sixteen years earlier. With no crime scene left to inspect, Poirot approaches the five surviving witnesses and asks each to provide a written account of the fatal day.
The resulting narratives reveal conflicting memories of marriage, jealousy, artistic selfishness and loyalty within a 1920s household. Poirot treats the differences in emphasis as evidence, showing how a historical mystery can be reconstructed from personality and language even when physical clues have disappeared.