Witnesses.

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.