The war of 1812 continues, and Jack Aubrey sets course for Cape Horn on a mission after his own heart: intercepting a powerful American frigate outward bound to play havoc with the British whaling trade. Stephen Maturin has fish of his own to fry in the world of secret intelligence. Disaster in various guises awaits them in the Great South Sea and in the far reaches of the Pacific: typhoons, castaways, shipwrecks, murder, and criminal insanity.