Bruno Testori is now a prisoner in his own jail, when Gregorio Verna, the head of the secret services, drops the charges against him and reinstates him as the director. In return, he must get an inmate, magistrate Vittorio Mancuso, accused of murdering an employee of the renowned energy company Slimpetroil Spa, to talk, discovering why he committed that crime before the man testifies in front of a GIP. When Bruno begins to suspect his innocence and fears that the services are using him, he decides to investigate further. It will be the beginning of a battle for the truth, the cost of which will prove to be extremely high.