Novelist Ariadne Oliver calls in her old friend Poirot to investigate a drowning at a Hallowe'en party

On the Orient Express from Istanbul, a ruthless American businessman is found dead. Poirot investigates and makes a life-changing decision.

Four clocks surround an unidentified corpse in a blind woman's house, and a young typist is summoned to the crime scene. However, Poirot is convinced that the complicated setup is merely hiding a simpler solution.

Poirot is attending a dinner party when one of the guests chokes to death on a cocktail. With no trace of poison, and no apparent motive, can it be murder?