A young woman, Lily Terrier, is found poisoned with cyanide in the hair salon where she works. Marleau discovers love letters that Frédéric Lefranc, actor and director at the municipal theatre, had addressed to the victim. And as he is about to give Othello, the drama of jealousy is probably not far away... But the investigation uncovers Lily's past, a shady past... What if Frédéric Lefranc, his wife and their three daughters knew much more than they want to admit? From the theatre scene to the crime scene, Marleau uncovers everyone's secrets.