After a century of war, revolutions, and imperial conquests, 1790s Europe is still embroiled in a battle for control of the sea and colonies. Tall ships navigate familiar and foreign waters, and ambitious young men without rank or status seek their futures in naval commands. First Lieutenant Alexander Clay of the frigate Agrius is self-made, clever, and ready for the new age. But the old world, dominated by patronage, retains a tight hold on advancement.

Captain Carlisle hails from Virginia, a loyal colony of the British Crown. As the clouds of war gather, Carlisle's small frigate is ordered to Toulon on a reconnaissance mission. If battling the winter weather in the Gulf of Lions is not a sufficient challenge, Carlisle must also juggle the delicate diplomatic issues in this period of pre-war tension while contending with an increasingly belligerent French frigate. But Carlisle has additional problems unique to his colonial origins.

A stroke of good fortune sees 12-year-old Martin escape his hard life and be taken on as a ship's boy and under steward to the captain in the Royal Navy frigate the Falcon. What follows is a chronicle of his talent for getting into and out of trouble at Gibraltar, the siege of Toulon, and against Barbary pirates.

The year 1792. With French revolutionary agents traveling freely but secretly between Ireland and England and war with France inevitable, the English government of Mr. Pitt is desperately anxious to uncover any plots between Irish rebels and the French. Lieutenant James Merriman with his ship, the sloop Aphrodite, is ordered to the Irish Sea to assist the principal treasury agent Mr. Grahame in this work. Merriman is plunged headlong into the world of espionage, and when Grahame is seriously wounded, it falls to Merriman to carry on the investigation.

It's 1941, and the fate of the world hangs in the balance. Across the stormy North Atlantic rages a battle between wolfpacks of U-boats and escort ships fighting to protect the Allies’ vital convoys. Meanwhile, teams of codebreakers at Bletchley Park struggle to penetrate the German Navy’s Top-Secret Dolphin code to unlock the flow of vital intelligence that will swing the battle in the Allies' favor.