The body of a Nigerian woman disappears from the morgue. The investigation leads to her daughter, forced into prostitution. Behind the mother's death lies a diamond trafficking ring. Meanwhile, to protect Gabriele, Vitale reveals to Battiston and Lamberti that he is an infiltrator in Malinconico's clan. The boy risks being discovered. Federico emerges from a coma and, after a confrontation with his brother, finally discovers the truth. A woman commits suicide in front of Sciacca: years earlier, he had handled the case of his daughter's disappearance and now asks for it to be reopened. The serial killer's twin brother arrives in Italy seeking revenge. Malinconico, struggling with his daughter, who is hospitalized for a poorly cut dose of drugs, refuses to help him. Costa is increasingly worried about Bianca.