March 1944, Nazi Germany needs to turn the tide of the war. Ahron Roth, captain of submarine U931, is ordered by Himmler to transport two SS officers and a new ‘super weapon’ to America.
The Atlantic crossing is full of dangers, from air and sea. Roth, battling both the enemy and the SS, is unwillingly drawn deeper into the plot, whilst questioning the actions of Germany and himself.
Somehow, he must outwit Admiral Sullivan, RN, who has a score to settle, plus the allied intelligence agencies who are tracking the elusive subs’ movements; but are unaware of the secret operation and the attack on America.