Robert Newton delivers an exceptional performance in this film, arguably the finest portrayal of a straight role I’ve witnessed from him. He plays "Riorden," a doctor who reaches his limit with his wife's affairs and resolves to eliminate her latest paramour, "Bill" (played by Phil Brown). Following an unexpected encounter at their residence, he inexplicably—and this represents the film's weakest point—manages to restrain Bill, securing him to a wall within a ruined basement. There, Riorden carries out a particularly gruesome yet untraceable scheme for murder and disposal, holding his captive for weeks. His wife, "Storm" (Sally Gray), becomes concerned when she senses something is wrong, and her worry intensifies with the disappearance of her cherished dog, "Monty," prompting her to involve the police. The rather ordinary "Insp. Finsbury" (Naunton Wayne) takes advantage of Riorden's self-assurance, and... one wonders if there might still be a chance for the prisoner facing such peril. As mentioned, the film’s opening feels rushed and demands that viewers overlook this flaw to appreciate the rest of the 95 minutes—though it should likely succeed in doing so; the suspense develops quite well. I must admit, I wasn't particularly fond of how things concluded, but you can form your own judgment.

Source on TMDB