The young wife of a wealthy art dealer is found savagely stabbed by her swimming pool. Chloé and Matthieu focus their investigation on the victim's husband, a possessive man in his fifties who is nowhere to be found.

A big-hearted activist is found dead in a fire at a run-down hotel. Matthieu struggles to deal with Chloé's blunders in a case where private and public lives are closely intertwined.

The father of a teenage girl who has been missing for several months receives an alarming letter regarding his daughter's condition. Matthieu and Chloé reopen the investigation.