Jack Aubrey, veteran of numerous battles, has been promoted to senior captain commanding a ship that has been sent out to reinforce the squadron blockading Toulon. Compared to the early days of the Napoleonic conflict, the action is slow, cold and dull. But a sudden turn of events takes Aubrey, and ship's surgeon and spy Stephen Maturin, off on a hazardous mission to the Greek Islands, where the skill, daring and, indeed, luck of both men will be tested to the utmost.