In a luxury complex, Petra and Antonio investigate the murder of a man with many hidden secrets.

The theft of a gun triggers a series of murders that lead Petra and Antonio into the world of child gangs... the arrival of Marco, the father of a young witness, impacts Petra's love life. What will their connection lead to? And what effect will it have on Petra and Antonio's relationship?

The corpse of a boy disguised as a devil leads Petra and Antonio to a terrible hidden truth.

We find Petra immersed in a new domestic balance and grappling with a new, extremely complicated case: a murder and theft of a relic inside a convent. In an attempt to unravel the mystery, Petra and Antonio must immerse themselves in the world of art theft and the highly secretive community of nuns, thus coming into contact with a concept of community that will touch Petra more deeply than she imagined.

Inspector Petra Delicato, a fascinating and contradictory woman, is called to investigate a series of rapes in the alleys of Genoa. All the assaults have a common denominator: a mysterious mark that the rapist carves on the girls' wrists. Forced to collaborate with Deputy Inspector Antonio Monte, Petra must embark on a dangerous manhunt that will prove more challenging than she could have ever imagined.

After appearing on a television program, Petra receives a package at the police station. Inside, preserved in a jar of formalin, is a surgically severed penis and a clue to decipher. Is it a threat or a dramatic cry for help? In the following days, more packages and new clues arrive. Petra and Antonio must enlist the help of Egor, a charming policeman recently arrived from Moscow, to solve a nightmarish puzzle.