Testori forces a North African prisoner to become his spy by infiltrating the Muslim group in exchange for a favorable report that the director would write. The director has bugged the cells so that he can listen to all the conversations including the one between Lombardo and Ciocci, an inmate with serious drug problems who is promptly transferred to prevent him from collaborating with her. The first clashes between Slavs and Nigerians begin and Massini to restore order agrees with Goran, who in fact becomes the successor of Lackovic, and Mansur. Testori instead makes an agreement with Aniello. Lombardo discovers that Testori had returned to prison in the middle of the night on the night of Lackovic's death and asks his superior to investigate further on the director.

Testori has understood that Lombardo is monitoring him and uses another number. One evening the PM lurks under the director's house and he confronts her with a hard face. Massini discovers that Piras takes money from a prisoner. Testori continues to study Muslims, even more so after the death of a jihad leader, and discovers that Muslims communicate with the outside world through books; meanwhile the broker Ibrahim is killed by a hit-and-run driver.