In this gripping thriller, a detective and forensic psychologist embarks on a harrowing investigation to track down a serial kidnapper and murderer who refers to himself as "Casanova." The stakes are raised when the detective's niece becomes one of the victims, leading to a desperate race against time. As the detective delves deeper into the case, he discovers that Casanova is not the only predator at large—another killer, known as "The Gentleman Caller," is committing similar crimes across the country. The narrative weaves a tale of suspense and terror as the detective must unravel the twisted motives of these killers while trying to save the lives of their captives before it's too late.

In this gripping psychological thriller, a high-stakes investigation unfolds in the French Pyrenees when the decapitated body of a horse is discovered hanging at the top of a cable car station. Commandant Martin Servaz, a seasoned but weary detective, is called in to tackle the case, which soon escalates as a serial killer with a disturbingly clinical approach to murder emerges. The trail leads Servaz to a nearby high-security psychiatric asylum, housing some of the country's most dangerous criminals, and forces him to confront his own demons. As the body count rises, the detective must unravel a complex web of clues that challenges his notions of justice and sanity in a race against time to stop the killer.