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.

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.

Midshipman Johnnie Wharton has no idea when he joins HMS St George as a 12-year-old that he is soon to take part in some of the greatest sea battles of Nelsons Royal Navy. Life aboard his next ship HMS Gibraltar is tough for the youngster and he and the other officers face disgrace as his Captain blunders badly at the Battle of the Glorious First of June.

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.