Romeo fights the Wolf Pack, who think he has denounced them to the police, but is saved at the last minute by a masked boy. Chased by the police, Romeo tries to sneak into a carriage going to Venice to escape Milan.

Since the Wolf Pack has no intention of stopping picking on the chimney sweeps, the Black Brothers, fed up with running away, decide to stand up to them. Thus, they draw up a plan to fight them in San Babila church. Meanwhile, Giovanni, the leader of the Wolf Pack, goes alone to a meeting with the rival gang Scorpion.

Matteo tells the boys the story of Marcello Rossi and Angeletta: a countess named Isabella is the girl's grandmother. Romeo now wants to find out everything and secretly follows Rossi to a castle where the Ice Queen, as Isabella is called by the others, lives.

Angeletta's greatest wish is to meet her grandmother, the Countess Isabella Montovani, before her serious illness progresses. The Black Brothers therefore drive Angeletta to the castle in a wooden cart. Rejected by the security guard, they climb over the wall. They are discovered and there is a chase in the castle courtyard.

Angeletta's condition is deteriorating rapidly. The so-called Ice Queen Montovani wants nothing to do with her granddaughter. Even asking chimney sweep Rossi is useless. The Black Brothers therefore clog the chimneys of Montovani Castle. They want to force the Countess to stay in touch with Angeletta.

Alfredo and Bianca are still on the run from their relatives. Their aunt and uncle want the badge that Alfredo hid. This badge was bestowed on Alfredo's father by Carlo Alberto, the father of the current Italian king, and legitimizes the Martini's fortune.

Alfredo wants to restore his honor before the King of Italy and accuse his aunt and uncle of murdering his parents. Unfortunately, the Wolf Pack lure him into a trap and lock him in the sewers. Romeo and the Black Brothers await his arrival so they can sneak into the banquet, but Romeo, seeing that he does not arrive, decides to go in search of him.

The big moment is here! Alfredo and his uncle Maurizio stand before the king of Italy. Both have badges in their hands, but only one belongs to the Martinis. When the king asks which badge has the secret sign of blessing, only Alfredo knows the right answer. The evil uncle is finally exposed.