The Crimson Stain Mystery (1916) is a Mystery, Horror film that follows in attempting to develop a chemical which would make a person super-intelligent, Dr. Montrose fails 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. The Crimson Stain Mystery is not currently listed with streaming providers in your selected region, but availability can change over time. Fans of mystery movies may also want to explore similar titles below.