Desc: The Crimson Stain Mystery: Directed by T. Hayes Hunter. With Maurice Costello, Ethel Grandin, Thomas J. McGrane, Olga Olonova. Dr. Montrose's attempts to develop a chemical which would make a person super-intelligent fail, and the subjects of his experiments metamorphose into hideous monsters who band together and prey on humans. With the police stymied, a young detective attempts to track down the leader of the group of killers, known only to have a small crimson stain in one eye.