This is a story of the loves and lives of two sailors - one German and one British, fighting for their people, their country and survival in the murderous first half of the 20th century. Battlefields are oceans. Two pitiless wars at sea, pitching British surface ships against German U-boats who are intent on blockade and starving Britain into submission. A third enemy common to both combatants only makes things indescribably worse: the unforgiving, cold and callous seas of the Atlantic and Arctic.