Using files declassified and released to Great Britain's National Archives, this article shows how Britain's domestic spy agency, MI5, recruited Louis de Wohl (1903-61), a flashy Hungarian astrologer and Christian writer to create horoscopes for Adolf Hitler during World War II. De Wohl was a controversial figure. His origin story does not check out. His MI5 handlers found him showy. And recent journalists dismiss him as a ‘persuasive fake’. Yet his pre-war fictions were adapted for cinema, his later theological novels remain bestsellers, and his personal story deserves greater attention if we are to better understand Christian historical fiction's popularity.