Charlie, a young promising police inspector, joins “36 Quai des Orfèvres”, an elite homicide squad criminal investigation department. His first task job: a gruesome rape and murder case. Despite several leads, it remains a cold case. 3 years later, a similar case comes to his attention. Charlie knows it’s the same man. As murders keep happening, he gets more and more frustrated, and obsessed with the manhunt. It will take him 7 years to track down one of the fiercer French serial killer.