When magistrate Matteo Arconti's namesake, an insurance man from Milan, is found dead outside the court buildings in Piazza Clodio, it's a coded warning to the authorities - a clear message of defiance and intimidation. Commissioner Alec Blume, all too familiar with Rome's criminal underclass, knows little of the Calabrian mafia currently under investigation by the magistrate. Handing control of the murder inquiry to his partner Caterina Mattiola, Blume goes in search of answers, setting off on a journey into the deep dark south of Italy...