Piero Tiberi

Maurizio Merli takes up a familiar role as Commissioner Berni; a cop who puts his life on the line to transport a witness from Corleone to New York City in order to testify against a mob boss on trial for murder. Along the way, Berni and his prisoner face a series of traps set up by the Mafia.

Luigi "Chinaman" Maietto escapes from prison. As soon as he is free he assigns immediately two henchman to murder the inspector whose testimonial once led to his prison sentence. Inspector Tanzi is left for dead but survives. The local newspapers cover up for him and pretend the assassination had succeeded. When Tanzi gets better, his superior wants him to hide in Switzerland. But Tanzi defies him because he intends to make sure himself that Maietto is put back in prison. He goes for it.

Bertone is a moderately honest homicide cop. Unfortunately, the court system is so inept and corrupt that many more-or-less honest policemen have begun taking the law into their own hands. Between his efforts to thwart the growth of crime and to control his vengeful co-workers, homicide-chief Bertone has his hands full