 When an amnesia victim, covered in blood, is found near the scene of a brutal murder aboard a moving train, the police are convinced they have their killer and bring Fitz in to get a confession. Fitz, however, is less convinced of the suspect s guilt, and takes it upon himself to help the man, the  John Doe  recover his memory while he searches for the real killer. Meanwhile, at Judith s insistence, Fitz attends a Gambler s Anonymous meeting, which culminates in Fitz leading the members in a betting frenzy.