Ramage & the Renegades — Dudley Pope

With the Treaty of Amiens signed, hostilities have ceased--at least on paper. Nelson's crews are standing down and Ramage is on leave when he receives secret Admiralty orders to inspect the small island of Trinidade off the coast of Brazil. Reaching the island, Ramage and the crew of the Calypso fetch up in a battle to free several captive merchant ships--and a beautiful woman passenger--as they cross swords with blood-thirsty pirates.