She is an Italian accountancy student in London. But the prime reason Immacolata Borelli came to Britain was to look after her gangster brother. Mario Castrolami is a senior Carabinieri investigator, his career dedicated to destroying the corruption and violence of clans such as Immacolata's family.
When Immacolata calls from London to say she is prepared to collaborate with justice, he knows she is setting in motion a terrifying series of events.