Entrusted with a secret mission, the perils of the South China Sea await. In the fight against the French, a treaty with the Sultan of Pulo Prabang, a piratical Malay state, may prove decisive. Captain Jack Aubrey and ship’s surgeon Stephen Maturin, along with a hand-picked crew, must survive the dangers of the high forties and convey a diplomatic envoy to ensure this key alliance, but dangers, both natural and man-made, will dog their every move. When echoes of the past return, no one is safe.