Detective Inspector Mitch Taylor is investigating a series of murders along with CSI agent Angel Morgan in Circular Quay, Sydney, Australia. Mitch tries to balance his family life, struggling to help his wife to deal with the recent loss of their baby at childbirth, while trying to solve the murders. The Police face increased pressure as the facts start to implicate some of their own. A homeless man may hold the answers, but Mitch will have to gain his trust. Crime is on the streets. Corruption and betrayal have built the walls. Trust is a myth. The circle of crime will reveal the truth.