As World War II raged into its second year, Britain sought a powerful ally to join its cause, yet America remained divided on the subject. Canadian-born MI6 officer William Stephenson—also known as Intrepid—was tasked with moving public opinion toward the fight, by any means necessary. Here the author of Agent M shows how Stephenson came to New York and flooded the American market with propaganda supporting Franklin Roosevelt and decrying Nazism. His chief opponent was Charles Lindbergh, campaigning under the populist slogan "America First." Henry Hemming chronicles the shadow duel between Lindbergh and Stephenson, each trying to sway the nation his way, with the lives of millions in the balance.