At the time of his death, Patrick O'Brian had begun to write a novel to follow on from Blue at the Mizzen, the twentieth book in the classic series. These are the chapters he had completed of the final voyage of Jack Aubrey and Stephen Maturin.

The story picks up from the end of ‘Blue at the Mizzen’ when Jack Aubrey receives the news, in Chile, of his elevation to flag rank: Rear Admiral of the Blue Squadron, with orders to sail to the South Africa station.

This novel, unfinished and untitled at the time of O’Brian’s death, would have been a chronicle of that mission, and much else besides. The chapters left on O'Brian's death are presented here both in printed version – including his corrections to the typescript – and a facsimilie of his manuscript, which goes several pages beyond the end of the typescript and includes marginal notes by O’Brian.'