Doctor Fian was deemed a notable sorcerer and was among many others that were put on trial. The pamphlet details their reasons for conducting sorcery, the methods used, how each of the witches were apprehended and the torture methods used in their punishments and death. The case of Doctor Fian follows his compact with Satan, a conflict he had with another witch who sabotaged an enchantment meant for her daughter, his examinations during the trial, the torture he endured, his escape and subsequent execution.