Desolation Island (Aubrey/Maturin Novels, 5) (Book 5)

Captain Bligh (yes, the guy from the Bounty) needs to be rescued, and the Royal Navy has the perfect man for the job: Captain Jack Aubrey. With his friend and cloak-and-dagger expert Stephen Maturin in tow, Aubrey sets off for Australia. Several factors, including an attractive spy and a small-scale epidemic, conspire to change his plans, and before long his frigate is being pursued into Antarctic waters by a Dutch man-of-war. Five installments into the series, the Aubrey-Maturin story remains (to quote The Observer) "the best thing afloat since Horatio Hornblower."