奔马酒店谋杀案 Murder at the Gallop (1963)

When Miss Marple and Mr. Stringer are soliciting for their charity that benefits paroled convicts, they call on the home of wealthy Mr. Enderby. They are shocked to witness his heart failure culminating in his fall down the stairs to his death. Miss Marple suspects that someone "frightened him to death" intentionally by a cat, but she cannot interest Inspector Craddock in her theory. She correctly surmises that one of Enderby's four heirs is guilty of his murder, and her theory is confirmed when two of them end up murdered.