It is 1944 and Germany is losing the Battle of the Atlantic. The much feared u-boats are being sunk one after the other and men and war material are reaching England and North Africa in ever increasing numbers. It is only a matter of time before the Allies mount an assault on Occupied Europe.

Hans Werner, a u-boat captain is given command of a new boat. She is fast, silent, and deadly and he must prepare to unleash her upon the unsuspecting Allied convoys. There is only one problem...Hitler doesn't know it exists.