This landmark film breaks a world scoop about the deception which fooled Hitler about the Normandy landings of 1944. In a tale of double agents and decoys, the investigation reveals, for the first time, the identity of the most secret of them all: George VI. It also uncovers how the Queen and future Queen Elizabeth II were enlisted in the ruse, and how the royal household managed to lose one of Britain's greatest secrets of WWII.