In the early summer of 1812, Captain Jack Aubrey and Dr Stephen Maturin arrive in Canada on HMS Shannon after escaping their American captors.
After long years at sea Aubrey and Maturin are on their way home as passengers on HMS Diligence, but a dangerous enemy is hard behind.
Dr Stephen Maturin takes a trip to Paris to address the Institute on matters scientific.
Dr Maturin heads to the Baltic to turn a Catalan brigade to the British cause.
Captain Aubrey and Dr Maturin are arrived in the Baltic on HMS Ariel and embark on a dangerous venture to the French-held island of Grimsholm.
Captain Aubrey has captured the Minnie and Dr Maturin is about to go on board.
The convoy returns to Carlscrona but before they can return home Aubrey and Maturin must make a long detour to Catalonia with the Catalan troops.
A gale is blowing up in the mouth of the Channel when HMS Ariel sights a French frigate on the windward side.
Shipwrecked on the treacherous Breton coast, Aubrey and Maturin pass once more into captivity.
Dr Maturin's greatest enemy has tracked him to Paris.
Captain Aubrey and he must lose not a minute to make their escape.