After a daring escape from a British prison, Philippe Kermorvant returns to France and gains command of a frigate in the Mediterranean, where France is trying to rebuild its decimated fleet.
Facing overwhelming odds, the fleet is forced to flee for refuge to a fortified bay. The prospect of an interminable blockade looms, but Philippe is given leave from his command to meet an enigmatic young general, who has a mission for him.
What follows is a shocking murder, a siege, a whirlwind romance and a duel to the death on the high seas, as Philippe contends with threats from every side. And amidst all this chaos, a terrible face from his past threatens to uproot everything that he has built for himself.