As the homicide squad moves into new quarters and welcomes new members, a dead woman in a park begins a new case, even as their legendary former boss Antonio Lazzaro [Massimo Ghini] returns from chasing drug dealers in Latin America. But the pivotal witness may well be a young boy.

Is the Dante-quoting serial killer gunning for homicide squad honcho Lazzaro? Meanwhile, there's the the murder to solve of the soccer-playing girl, her body dumped in a seaside warehouse, even as ex-lover/colleague Simona Colli finds a flimsy excuse to move in with Lazzaro to provide round-the-clock protection.

Tough problem for Lazzaro's squad: outside the office where a financial wheeler dealer lies dead, security cameras show everyone who came and went--but the two groups don't match up. And, after examining a cell completely lined with a hand-written copy of Dante's Divine Comedy, Lazzaro stalks colleague Simona Colli, even as a serial killer stalks him.

At a local arts center, one young man is hung, the other asphyxiated. Double suicide, right? Wrong! as the squad investigates what exactly broke up that group of kids at the conservatory, Lazzaro and Simona come to a kind of understanding, and the killer that haunts them leaves a bequest.

When a little boy disappears from an orphanage, the local homeless bum with a special way with birds looks good as the top suspect, but Lazzaro isn't satisfied, even as he has to contend with a further revelation from Simona, and a face to face meeting with his murderous stalker.

Looks like Lazzaro’s murderous stalker has definitely kidnapped the little girl Lazzaro has recently learned is his and Simona’s daughter. Two guesses as to what he’s going to want to trade for her. Will Lazzaro be the last notch on the revenger’s gun? The suspenseful finale to this six-part mini-series.