Blacklisted in Hollywood, director Edward Dmytryk managed to find work in England. Dmytryk's Obsession is based on Alec Coppel's suspense play A Man About a Dog. Robert Newton stars as Dr. Clive Riordan, the insanely jealous husband of unfaithful Storm Riordan (Sally Gray). Aware that Storm is having a torrid affair with an American named Bill Kronin (Phil Brown), Riordan kidnaps the man and chains him up in a deserted building, intending to kill him with an acid bath. The wife's dog, however, turns up at the last minute and spoils his plot. Obsession was released in the U.S. as The Hidden Room.