The film is set in Dartmoor, Devon. A London salesman plans to visit his roommate and his roommate’s family at an old mansion, but arrives shortly after the roommate’s death. He is invited to spend the night with the family, but the family members are then killed one by one. They were all heirs to the family estate, and one family member wants to be the sole surviving heir. They resort to familicide to get their inheritance ~ Tom Penderel, an American car salesman in London, delivers a car to an old mansion on Dartmoor for his eccentric roommate Casper Femm. The car is damaged by a falling statue in a raging storm. Tom enters the house, and finds that his roommate Casper is dead. Tom is invited to stay at the house by members of Casper’s family, including his twin brother Jasper, his cousins, the demure young Cecily and the seductive Morgana, and his Uncle Potiphar, who has been building an ark in anticipation of another great flood.

Each of the relatives is required to return to the dilapidated mansion before midnight each evening or forfeit his share of the family fortune. During the night, one of the Femm family dies every hour. First Agatha Femm, Casper’s mother, is discovered with her knitting needles stuck in her neck. Casper’s twin brother, Jasper, is the next victim, followed by Roderick, the head of the family.

Tom stumbles upon the fact that the killer is a woman, and he suspects Morgana, but discovers that Cecily is guilty just before she confesses, explaining that she wanted the entire family estate. Cecily runs from the house, and Tom discovers that she has placed time bombs in all of the clocks in the house. Racing against time, he frantically defuses each of the bombs. With moments to spare, he hurls the last bomb out of the window, and it explodes at Cecily’s feet.

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