While with Captain Jack Aubrey awaiting repairs on his ship in Malta, Stephen Maturin discovers that the island is home to a ruthless network of French spies. An unwilling French informer needs help from Maturin, who discovers her predicament and helps her. Meanwhile, a new Admiral arrives at Malta. He sends Aubrey on three missions across the Mediterranean to the Red Sea, one on borrowed ships, and two of the missions are traps. Aubrey escapes the predicaments, but Admiral Harte dies when his ship of the line is destroyed in an ambush. The high level double agent whose existence Maturin begins to suspect does not succeed in undoing either Maturin or Aubrey, yet.