A Caribbean mystery: A series of mysterious deaths on the Caribbean island where Miss Marple is vacationing calls to her mind a snapshot of a murderer that one of the victi had earlier brought to her attention.Taken at the flood: Shortly after marrying an attractive young widow, Gordon Cloade is killed by a bomb blast in the blitz. The former Mrs Underhay is now in sole possession of the family fortune. Poirot is approched by Gordon's sister in law claiming that Mrs Underhay's first husband is still alive.The seven dials mystery: Gerry Wade is a champion sleeper, so the other house guests decide to play a practical joke on him. Eight loud alarm clocks are set to go off, one after the other, starting at 6.30am. But when morning arrives, one clock is missing and the prank backfires with tragic consequences.