Spring 1941. The Third Reich has stepped up the U-boat offensive in an all-out effort to isolate Britain from her Allies.

For Baldur Wolz - Sea Wolf - the operation is a welcome challenge giving him the opportunity to increase the number of enemy convoys sent to an icy death. Fresh from a deadly and dangerous mission in Iceland, Wolz and his crew await the signal to attack.

But disaster strikes. A lethal accident leaves Wolz adrift in the Atlantic and the Sea Wolf faces his greatest test of endurance amidst the killer wolf packs of the sea at war...