Witnesses (French: Les Témoins) is a French police procedural television series, created by Marc Herpoux and Hervé Hadmar. In the first season, police detectives Sandra Winckler and Justin investigate when bodies of murder victims are unearthed and left for discovery in the show homes of a housing developer. Former chief-of-police, Paul Maisonneuve, is implicated. In the second season, Sandra and Justin find themselves on the trail of a serial killer whose modus operandi is to murder all former lovers of his kidnap victims.

In the small bordertown of Villefranche, lost in the heart of a large forest, crime rate is six times higher than elsewhere in the area. Each new crime Major Laurène Weiss solves with the help of her unusual team makes her sink deeper and deeper into secrets of the area.