The meeting with Ekaterina has borne fruit and the men of the X Tuscolano finally have a name to investigate: Mara Fermi, the escort Luca was tailing the night he was killed. But the lead is thin and the girl has no criminal record, and Leo decides that the best way to get the information they need from her is for someone to become her confidant. While Corallo continues to prepare his escape, Leo intensifies his research on the sports club attended by Mara. In the meantime, his relationship with Valentina becomes more and more passionate, but a nasty surprise awaits him.