1814. The Gulf Coast is on the brink of invasion - and a deadly conspiracy lurks in the shadows.

Commanding the powerful American frigate Macedonian, Captain Favian Markham arrives in New Orleans bearing alarming news: a massive British expedition is gathering to strike at the city and seize control of the Mississippi. As the defenders scramble to prepare, a more sinister threat emerges from the marshes and islands of the Gulf Coast.

On remote Cat Island, pirates, smugglers and privateers have united under mysterious leaders. What begins as a raid against a lawless stronghold soon uncovers a secret society of fanatical veterans devoted to the fallen Emperor Napoleon. Hardened by the battlefields of Europe, they dream of restoring their master's fortunes, and will kill anyone who stands in their way.

With British warships closing on Louisiana and enemies hidden among friend and foe alike, Favian must lead a daring expedition into the shallow waters of the Mississippi Sound. There, amid treacherous channels, pirate schooners and desperate fighting, the fate of New Orleans may be decided before the British army even reaches its shores.

Filled with naval action, intrigue, privateers, pirates and historical adventure, Cat Island is a thrilling tale of the War of 1812 and the fifth instalment of Walter Jon Williams' acclaimed Privateers & Gentlemen series.