The Haunted Strangler (1958)

A novelist and social reformer (Boris Karloff) seeks to prove that a young man executed 20 years ago for a series of brutal murders was, in fact, innocent. But his deep investigation into the matter uncovers a horrific fact that he never anticipated. Directed by Robert Day, this is an effective Jekyll and Hyde-ish yarn with a solid performance by Karloff, who gets a chance to exercise his acting chops. It's not as good as CORRIDORS OF BLOOD, another film Karloff made with Robert Day around the same time but it serves as a nice companion piece. There's a choice supporting turn by Jean Kent as an aging music hall star, who was a witness against the executed man. Nothing special really and I wouldn't say seek it out but if you come across it, you should find it a pleasant way to pass the time. With Elizabeth Allan (TALE OF TWO CITIES), Vera Day, Tim Turner and Anthony Dawson (DIAL M FOR MURDER).