En Costas Extrañas by Tim Powers

Set in the early 18th century, this swashbuckling tale follows the adventures of John Chandagnac, a bookkeeper turned pirate, as he navigates the treacherous waters of the Caribbean. After a shipwreck leaves him at the mercy of a notorious pirate crew, he is thrust into a world of voodoo magic, supernatural forces, and the quest for the legendary Fountain of Youth. As he grapples with his new identity and the moral complexities of piracy, he must confront powerful enemies and his own inner demons to survive in a realm where reality and myth intertwine.