Quick recap
April 1805. Captain Jack Aubrey's British frigate HMS Surprise is ambushed off Brazil by the French privateer Acheron, a bigger and better-armed ship. Aubrey slips away into a fog bank and, instead of heading back for repairs, decides to hunt the enemy down. In the Galápagos, Aubrey's best friend, the doctor and naturalist Stephen Maturin, is shot by accident and operates on himself. Disguised as a whaler, the Surprise lures the Acheron in and takes her by boarding. At the end, Aubrey realizes the French captain had posed as the ship's surgeon, and he turns back to the chase.