The Frozen Dead by Bernard Minier
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.