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Alice Pengelley visits Poirot in London, telling him she thinks she is being poisoned by her husband. When Poirot arrives in Cornwall the next day to investigate Mrs. Pengelley's charges, he is too late, and finds her dead.
When a Chinese businessman with a map to a long lost silver mine is found dead in Chinatown, Poirot must find the map and killer.
Poirot wagers Chief Inspector Japp that he can solve the mystery of a missing banker without leaving his flat.