Code Name: Casket

In March 1940, the division of MI5 tasked with capturing German agents infiltrated into England and turning them back against their Abwehr masters gets its hands on Ray Swindon, London hardman – code-named Casket. Swindon leads his MI5 controllers to two other in-place German agents. For the next several months, the Casket ring feeds a steady stream of misinformation to the Hamburg Stelle. Then, in order to boost Casket's credentials with Hamburg, MI5 mounts a controlled-sabotage operation at a bomber manufacturing plant. It goes wrong; many people are killed. The public of Great Britain demands the capture of the perpetrators. The three spies in the Casket ring are brought from the facility where they have been imprisoned since their capture and sacrificed to conceal the involvement of MI5 operatives in the tragedy. But Casket escapes. In the hunt for him, the scene shifts from Blitz-torn London to the U-boat infested Atlantic, to the Rock of Gibraltar and finally to a bloody climax in the dusty country lanes of the Spanish port of Algeciras.