Cat Island

Cat Island is the final book in Walter Jon Williams' Privateers & Gentlemen series. It is actually the culmination of two story lines. One story line follows the career of Captain Favian Markham, USN. His story began in Brig of War and continued in The Macedonian. The other story is told in The Tern Schooner. It follows the adventures Gideon Markham, an American privateer who is also Favian's cousin. Those stories merge in Cat Island as Favian and Gideon team up to try and stop an imminent British attack on New Orleans.
Those who like action packed stories of high seas adventure, will probably like Cat Island. However, you should read the other books in the series first. They are all good reads.