The first book produced by Taxil after his conversion was a four-volume history of Freemasonry, which contained fictitious eyewitness verifications of their participation in Satanism. With a collaborator who published as "Dr. Karl Hacks", Taxil wrote another book called "Le Diable au XIXe siècle" ("The Devil in the Nineteenth Century"), which introduced a new character, Diana Vaughan, a supposed descendant of the Rosicrucian alchemist Thomas Vaughan. The book contained many tales about her encounters with incarnate demons, one of whom was supposed to have written prophecies on her back with its tail, and another who played the piano while in the shape of a crocodile.