The author was inspired to write this book following the discovery of a bundle of previously unseen letters written by Hitler's father, Alois.

The bundle of 31 letters, the pages of which had long yellowed with age, had lain hidden in the attic where they were found for over a century. Only when the razor-sharp script was examined further did historians discover just who had written them - and that person, Alois, was Adolf Hitler's father.