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Detective Hercule Poirot receives a letter from a potential client. The wealthy lady, Miss Arundell, writes that she suspects her relatives of trying to kill her: she is recovering from a fall down the stairs. According to the victim's nephews, the incident was the dog's fault, as the dog allegedly left its toy on the stairs, which caused Miss Arundell to trip over it. However, the seemingly simple case instantly becomes more complicated when Poirot learns that he received the letter after the rich woman's death.

The detective undertakes to investigate the alleged murder in secret, because all the woman's relatives have a motive: her wealth should be inherited by them. However, when it becomes clear that Miss Arundell has rewritten her will, the mysterious deaths resume. Is one of the heirs trying to get rid of the competition? Or are these deaths accidental? Hercule Poirot skilfully investigates the case, meticulously collecting evidence to finally name the true cause of the tragedies.