Based on author Patrick OBrians series of Aubrey/Maturin novels, the movie is set during the Napoleonic Wars. Crowe is Captain Lucky Jack Aubrey, renowned as a fighting captain in the British Navy, and Paul Bettany is ships doctor Stephen Maturin. Their ship, the H.M.S. Surprise, is suddenly attacked by a superior enemy. With the Surprise badly damaged and much of his crew injured, Aubrey is torn between duty and friendship as he pursues a high stakes chase across two oceans, to intercept and capture his foe. It is a mission that can make his reputation or destroy Lucky Jack and his crew.