Robbie Coltrane stars as the criminal psychologist Fitz in the first story from the popular series written by Jimmy Mc Govern. When a student of Fitz's is butchered on a train, an unconscious, blood-stained man (Adrian Dunbar) discovered near the scene of the crime soon becomes the number-one suspect. The man claims to be suffering from amnesia, & Fitz is brought in to help uncover the truth.