Murder in Biot

Marie Lemaire, widow of Francois Lemaire, is poisoned in a business dinner and dead. Prosecutor Elisabeth Richard and Gendarmerie Captain Charles Jouanic are charged with the investigation. One of the guests Clementine Roux was witnessed to arguing with Marie, but she claims they quarreled because Marie decided to withdraw from their plan of running a guesthouse together. Another one of the guests Olivia Rousseau, ex-wife of Francois, who left her to marry Marie, is found dead and leaves a suicide note declaring that she poisoned Marie because she blamed Marie for murdering Francois. Soon Francois's nephew Hugo Fontaine is assaulted in an attempted murder and sent to hospital. The investigators learn from Fontaine's fiancee Julie Caron that Fontaine contacted allegedly Marie's psychiatric clinic and found out the psychotic one is Roux instead of Marie. Roux killed Marie for she has paranoid schizophrenia of being in love with Marie and of being abandoned. Next, she has Rousseau to be the scapegoat. Moreover, after she realizes her secret is out, she has to silence Fontaine and Caron. When Roux is trying to kill Caron, the investigators stop her in time and save Caron.