By 1540, piracy, with some encouragement from the English and French governments, was thriving in the Caribbean. Much has been written about the pirates who infested that bubbling cauldron, but very little about the hardiest of them all: the ones who crossed the jungles of Central America and sailed through the perilous Straits of Magellan or around Cape Horn to sack the ports of New Spain and capture the Spanish galleons loaded with riches. At least...