Under Enemy Colors by Sean Thomas Russell

In the tradition of Jack Aubrey and Horatio Hornblower comes a new hero of the high seas-- Charles Hayden, lieutenant of the Themis.

Around the time of the French Revolution, Charles Saunders Hayden is one of Britain's most able naval officers, an ambitious young lieutenant born to an English father and a French mother. But despite his abilities and his unshakable loyalty to Britain, Hayden's career is damned by his "mixed" heritage and lack of connections... which is how he finds himself assigned to the Themis, a frigate under the command of Captain Josiah Hart-- an officer reviled by his crew for both his brutality toward his men and his faint-heartedness in battle.

As the Themis takes to sea in search of French warships, Hayden immediately senses the unrest of the crew. Even by the rough standards of seafaring, the Themis is a cruel and desperate place. Men have died under mysterious circumstances, and warring factions among the sailors put the ship at risk, just as the French press their attack. Caught between his superior and a crew pushed toward mutiny, Hayden finds himself in the middle of a revolution at sea, torn between honor and duty, as the magnificent British navy engages the French in a centuries-old struggle for power.