At the height of Hitler's infamous U-boat war, the crew of the U.S.S. Swordfish were heading home after months at sea. They never made it. Now prisoners of war aboard U-boat 429, a small group of American survivors will find their loyalties put to the ultimate test when they're forced to join their German captors to fight for their very lives.

MI6 agent Derren Stone is sent to Costa Blanca, Spain to investigate a connection between a local crime syndicate and major players out of Beijing.