Joaquin Shannon arrives home from a cruise on his fishing boat. His first mate, Charles Nelson, is to marry Shannon's sister the next day. Nelson gets drunk and Shannon finds him near the unconscious body of a man that he, Shaoon, had been fighting with previously. The man dies and Shannon takes the blame and goes to prison. There he gets into trouble instigated by "Big Red" Kincaid and is denied a parole. He stops a prison break and get a parole. Not able to get work, he takes a job with a former convict on a fishing boat. Kincaid, who has shot a guard and escaped and vowing vengeance on Shaoon, shows up.