History does not forgive; it sinks for a long time, but then inexorably always returns. The ones to reckon with this eternal movement will be Chief Ofelio Guerini, head of the police headquarters in Milan, and the people he loves most. The story begins with a bang: the Guerini family is shaken by the unexpected arrest of young Gregorio who is sent to the San Vittore prison accused of participating in an armed band, a very heavy accusation in the year 1979 marked by terrorism, April the 7th arrests and the special laws against terrorism. It is an absurd accusation which Guerini doesn’t believe for a moment; in fact, he thinks that the real target of the initiative is not his nephew, but he himself, an anomalous police chief, a rare example of a communist “grafted” by force into the rank and file of the Italian police during the times of a far-off history – the Resistance and the “wind from the North” – now vanished. Someone, who strikes from the shadows and indirectly perhaps cannot forgive Guerini for his affiliation. That form of diversity neither exhibited nor publicly claimed, but tenaciously conserved as testimony of his dignity. It will be a merciless battle against an invisible adversary, a private cold war with terribly high stakes: not so much the truth or discovery of his enemy’s identity, but the lives of his nephew Gregorio, his wife Maria, his relatives and his men at the police station. And finally, for Ofelio Guerini, his own life.