November 1917.

The First World War is on a knife-edge - and the British Empire in mortal danger.

Commander David Cochrane Smith is about to embark on his most perilous adventure yet.

The Imperial German Navy has sent Kapitan-zur-See Erwin Voss to command the mighty new battle cruiser Salzburg in the Adriatic.

Smith is ordered by the Admiralty to find and attack her in harbour — a seemingly suicidal task which is made all the more hopeless when he runs into the opposition of his superiors in Venice.

But it is a vital mission and Smith knows he must go it alone.

Though the odds are stacked against him and his tiny crew, his orders are inflexible.

Wipe out the enemy.

Commanding three small torpedo boats, Smith finds himself relentlessly hunted as Voss and the Salzberg score victory after victory.

Finally, Smith sees one last chance to avert all-out disaster - he stakes everything on one final attempt to seek out and destroy…