Knockout noirish thriller from Anthony Mann ("T-Men") centers on chemist Brenda Marshall, who tests an anesthesia she invented by injecting herself with it. Marshall's life soon turns hellish as her fiancé spurns her, she is blackmailed, and her face is damaged in an explosion. But is everything as it seems? William Gargan, Hillary Brooke, H.B. Warner, and Lyle Talbot also star. 68 min. Standard; Soundtrack: English.