Giulia Corsi hostage of Oscar Romero. These are dramatic hours for her, for her and for Barbara Rostagno who finds herself hunting the man who killed her sister... Meanwhile, the case of a broken family, the Ricciardis, torn apart by the sudden return of a 'ghost', erupts at X like a tsunami. The man who killed Paolo Libero doesn't have a name yet, but Giulia Corsi has never been so close to him. Just like Luca, who has never been so close to Remo and meets him again in a tragic and violent circumstance. Meanwhile, the case of a dead researcher will shed light on new scams and old gossip in the academic world.