A British naval officer has a brief affair with a woman in England and never knows that she bears him a son. 20 years later the boy is on a ship under his command when he is tracking a German Raider. When the boy is captured after his ship is sunk, he finds a way to slow the German's progress while a lethal hunt for him goes on.

Tras mantener una aventura con un oficial de la marina británica, una mujer inglesa se queda embarazada, pero a él no se lo hace saber. 20 años más tarde, el niño, que viajaba en un barco, es capturado por los alemanes...