It was an age of empire, an age of contrast, and an age of dramatic change - and one which would determine the destinies of nations as well as of men. Captain Philip Blackwood of the Royal Marines rejoins his ship, HMS Audacious, in August of 1850, anxious to get back into action. "Per Mare - Per Terram" is the marines' motto. In the torturous heat of Africa, where they are sent to stamp out the remaining strongholds of slavery, and later, in the bitter war of the Crimea, Philip Blackwood and his men learn to obey it without question.

The crack German cruiser Prinz Luitpold had always been lucky in battle. To the beleaguered army on the Baltic coast she was their one remaining symbol of hope. But it is the summer of 1944, and on every front the war is going badly for Germany. When the order comes to leave the Baltic to attack and destroy enemy shipping in the Atlantic, Kapitan zur See Dieter Hechler knows that once out in this vast killing ground it will only be a matter of time before the hunter becomes the hunted.

When Captain Guy Sherbrooke joins HMS Reliant in 1943, he knows he may be her last Captain. Sister battleships have been destroyed, and Sherbrooke cannot alter the bitter truth that there will be no half measures for HMS Reliant.

October 1772, Portsmouth. Sixteen-year-old Richard Bolitho waits to join the Gorgon, ordered to sail to the west coast of Africa and to destroy those who challenge the King's Navy. For Bolitho, and for many of the crew, it is a severe and testing initiation into the game of seamanship.

It was in 1943. On the Black Sea, the Russians were fighting a desperate battle to regain control. But the Russians’ one real weakness was on the water: whatever they did, the Germans did it better, and the daring hit-and-run tactics of the E-boats plagued them. At last the British agreed to send them a small flotilla of motor torpedo boats under the command of John Devane. Devane had been in the Navy since the outbreak of war.