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When, during the carnival celebrations, the body of Eleonora Fontana, daughter of a well-known politician, is found in Bellinzona, detective Blum decides to put together a special team to tackle the complex investigation. In fact, the crime seems to have its roots in a past full of shadows and never-healed wounds.

The recent threats addressed to the victim's father lead detective Blum and his team to investigate the suicide of an important industrialist. At least until a second corpse is found, presenting traces attributable to the case of a ruthless serial killer who died eleven years earlier.

Now that the link between the Rochat case and the murders of the girls is evident, the detectives decide to start again with investigations from the past. Thus they discover the identity of two witnesses of the old serial killer suicide. But what happened to the third? And where is his daughter now?

What if in 2012 things hadn't gone as they have always been told so far? Some secrets revealed after years of silence and a third brutal murder force detective Blum and his team to consider new leads and possible alternative motives for Amanda and Eleonora's assassinations.

While detective Blum fights against the ghosts of his past, the search for the Meiers becomes increasingly frenetic. In fact, the team no longer has doubts: father and daughter are at the center of the serial killer's murderous fury. When a witness finally decides to reveal the murderer's identity, the end seems truly near.

Even though his identity has now been revealed, the serial killer has no intention of giving up. The murderer is in fact determined to carry out his revenge at all costs, striking the last inexorable blow. Will detective Blum's team be able to stop him in time, revealing once and for all the truth of yesterday and today?