It is 1801, and President Thomas Jefferson has assembled a deep-water navy to fight the growing threat of piracy, as American civilians are regularly kidnapped by Islamist brigands and held for ransom, enslaved, or killed, all at their captors' whim. The Berber States of North Africa, especially Tripoli, claimed their faith gave them the right to pillage anyone who did not submit to their religion.

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.

After gaining valuable experience as an aide to Governor Lord Horatio Hornblower, William Brewer is rewarded with a posting as first lieutenant on the frigate HMS Defiant, bound for American waters. Early in their travels, it seems as though Brewer’s greatest challenge will be evading the wrath of a tyrannical captain who has taken an active dislike to him. But when a hurricane sweeps away the captain, the young lieutenant is forced to assume command of the damaged ship, and a crew suffering from low morale. 

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.