Following the attack on Commissioner Fontana by the fugitive Morace, archivist Parmesan risks his life due to a heart attack. Agents Valli and Gori investigate the death of a Nigerian prostitute who was trying to get out of the business, while Raffaele and Luca, struggling with the theft of a special ink for printing banknotes, make an unpleasant discovery about Giorgio, Anna's new boyfriend. Among the documents of the murdered fixer, Commissioner Fontana, thanks to Nina's collaboration, finds evidence of a horrendous crime that allows the arrest of Neri Giorgio. But at the moment of the arrest the boss feels ill and Benvenuto is forced to follow him in an ambulance. In the meantime Raffaele investigates the attempted suicide of Marinella and Maurizio, a couple saved by their fourteen-year-old son Silvio. Agent Marchetti suspects a story of usury, which he experienced firsthand, and risks a lot with unorthodox procedures in order to frame the person responsible.