During World War II, German refugee Louis de Wohl made a curious offer to British Intelligence, claiming that he could reveal what advice the Fuhrer's astrologers were giving him. Rather than dismissing de Wohl as a crank, senior intelligence officers put De Wohl in charge of a one-man Psychological Research Bureau, later sending him to America on a propaganda mission. Telling an odd tale, James Parris considers: Was de Wohl genuine or a charlatan? And did his astrological readings contribute to the downfall of Nazi Germany?