Across Italy hundreds of mafia leaders, hitmen and drug-traffickers are being jailed thanks to the most powerful weapon now in the hands of Italy’s anti-mafia investigators: the words of one clan against another. Italy’s state collaborator scheme has seen mafia chiefs breaking the code of silence - in return for a lifetime in witness protection, rather than a life behind bars. For Assignment, Dominic Casciani gets exclusive access to an anti-mafia prison to meet one of Naples' most important “Penitents” - a boss and killer whose evidence has jailed his associates. In the city itself, he witnesses, alongside hardened investigators, the ongoing nightly battle against the Camorra - and also hears voices of hope across the city that the tide has finally turned. Presenter: Dominic Casciani Producer: Sheila Cook Image: Gennaro Panzuto Credit: Private