Simone, 65 years old, is found dead at her home during an operation led by Raphaël and his narcotics team. Indeed, Simone is part of the network of "drug-dealing grannies." Is her murder simply linked to her involvement in the drug trade? The staging of the body in a semblance of prayer suggests otherwise. Julia and Novak's team is called in to try to solve this mystery. This joint investigation between the narcotics team and the criminal investigation unit will reignite rivalries between the two men in Julia's life. It's challenging to keep a cool head in this mix of emotions. Between nostalgia and regret, this episode will be rich in revelations, and who knows, it might give Novak the keys to understanding Julia's past.