The autopsy of Laura, whose body was buried under the tarmac of the university courtyard, shows that she was murdered 20 years ago. But then how could Laura's blood end up on her clothes? While the police increase the pressure, Fanny can count on the support of Maxence and Julien, even if jealousy grows... But the more Fanny becomes convinced that Chloé is still alive, the more she feels the trap closing.