From the author of the bestselling U-boat series, comes a fabulous new series about the war at sea.Lieutenant-Commander Cavendish R.N. was cashiered from the navy after master-minding a dummy torpedo run during peacetime on the pride of Nazi Germany's new navy. As far as everyone knew he later died in a racing car accident and the case was forgotten. Except by his First Lieutenant Nick Hamilton, who, by 1940, was commanding his own submarine, HMS Rapier. When Hamilton made an audacious attack on the Nazi prison ship, Norse, he discovered that Cavendish was not dead at all-and he and HMS Rapier were involved in the most terrifying adventure of their career...