This audiobook is narrated by an AI Voice. A young journalist is found brutally murdered in an abandoned parking garage in Darmstadt. Her last message to her sister contains only four cryptic words: "Sand pit. He's back". For Detective Chief Inspector Daniel Berg, an investigator scarred by the demons of his past, this is more than just a new case. It's the gruesome reopening of the unsolved "Sandpit Case" that destroyed his career seven years ago.

While Berg relies on his instincts, his young and brilliant partner, Nadja Reinhardt, trusts in data and algorithms. Their trail leads them deep into the digital abyss of the darknet, to a forum called "Wolf's Den" , where a sadistic leader fuels the paranoia in the city and uses a growing legend of a werewolf murderer as a cover for his crimes.

The hunt becomes a race against time as the killer begins to eliminate anyone who gets too close to the truth. In a city paralyzed by fear, the mismatched pair of detectives must overcome the boundaries between analog police work and digital warfare to catch the monster. But the murderer is not just a brutal killer—he is a psychologist playing a perverse game , confronting Berg with his own painful past