When George Washington beat a hasty retreat from New York City in August 1776, many thought the American Revolution might soon be over. Instead, Washington rallied—thanks in large part to a little-known, top-secret group called the Culper Spy Ring. He realized that he couldn’t defeat the British with military might, so he recruited a sophisticated and deeply secretive intelligence network to infiltrate New York.

Drawing on extensive research, Brian Kilmeade and Don Yaeger have offered fascinating portraits of these spies: a reserved Quaker merchant, a tavern keeper, a brash young longshoreman, a curmudgeonly Long Island bachelor, a coffeehouse owner, and a mysterious woman. Long unrecognized, the secret six are finally receiving their due among the pantheon of American heroes.