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Andrea is a child affected by selective mutism, a widespread pathology, quite unknown among the youngest. Often doctors couldn't help Andrea simply because his problem is rare, often not recognized because not studied. But someone starts to understand and help Andrea, recognizing his problem as a social integration issue.

In the countryside around Norbello, a town in central Sardinia, a series of murders of young women is the focus of an investigation led by Anna Carreras, an inspector with the Violent Crime Analysis Unit who is not one to follow the rules. Working alongside her is a rookie inspector, Fiorenzo Vargas, who helps her unravel a bloody mystery in which one of the victims is Claudia Carreras, the young inspector’s sister. How many rules will Anna be willing to break to catch the culprit?