A government operative poses as an imprisoned thief in an attempt to take down a gang organising break-outs for wealthy convicts, working his way into the inner circle of a Russian double agent who is suspected of being the next planned escapee. Espionage thriller, starring Paul Newman, James Mason, Ian Bannen, Michael Hordern and Harry Andrews.

A member of British Intelligence assumes a fictitious criminal identity and allows himself to be caught, imprisoned, and freed in order to infiltrate a spy organization and expose a traitor; only, someone finds him out and exposes him to the gang...