"In Sorte Diaboli" is a novel by the author Andreas Gruber, blending elements of horror and thriller. The story follows a detective named Walter Pulaski as he investigates a series of gruesome murders linked to a dark cult. The narrative explores themes of evil, obsession, and the supernatural. Set in Austria, the novel delves into the psychological aspects of its characters, particularly the impact of trauma and the nature of good versus evil. As Pulaski uncovers the truth, he faces moral dilemmas and confronts his own past, making the story both gripping and thought-provoking.