AllMovie

Slick gambler/burglar Brian Donlevy breaks into the house of Henry Daniell and his wife Diana Barrymore. Daniell is promptly murdered, and both the intruder and the wife fall under suspicion. Donlevy and Barrymore go on the lam, pursued by the cops--and by the Nazi spies who committed the murder. Nightmare was Brian Donlevy's favorite film, and the character of dishonest-but-decent gambler Daniel Shayne was Donlevy's favorite role; he later utilized the same characterization (under a different name) on the radio and TV series Dangerous Assignment. Nightmare also represented the best screen showing for the benighted Diana Barrymore, though unlike Donlevy she didn't think much of the assignment.