The Morning of the Magicians
Its authors took 'Vril', the fictional energy of an 1871 science-fiction novel, and made it the creed of a secret society said to have guided the Third Reich, building on Willy Ley's 1947 account of a Berlin group that sought Vril. Most popular claims of a hidden Nazi occult inner circle trace to this book, not to any wartime document.
Louis Pauwels & Jacques Bergier, Le Matin des magiciens (1960); Willy Ley, 'Pseudoscience in Naziland', Astounding Science Fiction (1947); Edward Bulwer-Lytton, The Coming Race (1871)
A 1960 French bestseller that single-handedly created the modern popular genre of 'Nazi occultism'.