Until now, the detective stories by author Paul Sanders had always sold splendidly – ​​likely due in no small part to the fact that he always tested all his murderous tricks on his long-suffering secretary, and that all the cases came from the archive of his friend Caspar Natter, a retired police detective. Sanders was all the more shocked, therefore, when his publisher informed him that readers were no longer interested in his books, a fact confirmed by the weak sales figures.