Mauro, is engaged in a difficult anti-drug operation. In the meantime, the wedding between Commissioner Giulia Corsi and Inspector Paolo Libero is about to be celebrated. Ardenzi is taken hostage by a bandit during the anti-drug operation.

While Giulia is still trying to shed light on what happened ten years earlier - the day of the assassination of her father, Judge Corsi - a particularly delicate situation arises at the 10th Tuscolano police station: a man, who had just been evicted, reacted to the police by shooting from the apartment in which he had barricaded himself, then opened the gas cylinder and took a little girl hostage.

Ardenzi and Belli are trying to track down a robber, while Ingargiola, Vittoria Guerra and Parmesan receive a series of strange reports from men who claim to have been robbed under a specific overpass, all in different circumstances. Meanwhile, Giulia receives important revelations about her father's murder.