Ardenzi has escaped, Guaraldi has finally been arrested, and Sabatini is still on the run, this time accompanied by Daria. But the former agent refuses to give up and continues his strenuous search for the stolen diamonds. Guaraldi himself refuses to accept defeat and plans a prison break with his accomplices. Meanwhile, Mauretta finds herself collaborating with the team on the case of a serial rapist, without telling her father.

While Sabatini is on the trail of Guaraldi and the diamonds, the Mafia Capitale investigation has reached a critical point: Ardenzi and the Flying Squad are closing in on the boss of the "underworld," Zoppo, who operates under the aegis of the mysterious Architect. Meanwhile, the time has come for Isabella to confront her stalker head-on, alone and without the support of Ardenzi and her colleagues.