Sabina's boyfriend confesses to Giulia Corsi that he bought the pills in a nightclub. The commissioner, to find out who put his sister's life at risk, has some officers pretend to be drug dealers. They try to capture a drug trafficker who passes himself off as a merchant and lives on a yacht. Vittoria is depressed because the judge has taken away her custody of her son. Luca and Valeria guard the clinic where Professor Monti resides.