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After recovering from a traumatic head injury, young scientist Jim Ackland (John Mills) relocates to a rundown boarding house while he continues to undergo treatment for blackouts, during which he remembers nothing. Resuming work at a chemical factory, John begins a relationship with the boss' daughter, the confident Jenny Carden (Joan Greenwood). After Jim kindly loans money to a fellow boarder, she is found murdered -- and unable to recall his actions, Jim is the prime suspect. Wikipedia