Beecher White, a humble archivist at the U.S. National Archives by day, has a secret: he belongs to the Culper Ring, a network of spies founded by George Washington during the American Revolution. While working for the Culper Ring, White has discovered countless secrets and saved more lives than he knows—including the President's. And then, one day, White makes an alarming discovery on the White House grounds: a severed arm buried in the Rose Garden. As he investigates, he realises it's a message...one that may have dire repercussions for the President.