It's late May 1944. Captain Billy Boyle is court-martialed on spurious charges of black market dealings. The chief witness against him is Archie Chapman, the London gangster last seen in Rag and Bone, and Boyle is convicted. Stripped of his officer's rank, reduced to private and sentenced to three month's hard labour, Boyle is given an opportunity: he can avoid his punishment if he accepts a dangerous mission.
