In this taut crime thriller, a quiet bank clerk spends his little vacation in Indianapolis and then returns to his little boarding house in Ohio. There he hears a radio newscast about the corpse of a girl found in Indianapolis; he then hears a description of the killer and is appalled to realize that he matches it exactly. Soon many are looking at him with alarming suspicion. More young women die, and each time more and more evidence links him to the crimes. The people begin believing that he has a split personality, like Dr. Jekyll and Mr. Hyde. Is he really a psycho killer, or is someone else behind the terrible crimes?