A luxury watch manufacturer is found dead. His attractive wife is the key suspect. Apart from the huge fortune she'll inherit, it transpires that her previous husbands, also wealthy men, died in suspicious circumstances. Much to everyone's surprise, Adeline Briard is back after seven months away.
During Déborah and Pierre's wedding ceremony, Kader Cherif and his colleagues from the squad all simultaneously receive the same message: a photo of a woman with a blurred face. They have four hours to prevent her murder. At the same time, Kader discovers the true reason for Adeline's return.
Kader and Adeline investigate the death of a Lyon garage owner's son. The case brings them in contact with criminologist Xavier Lamarre. An arrogant and condescending man, Lamarre is himself suspected of having murdered his wife. Sarah has the chance to spend a year in the United States.