Carl Williams begins his deadly revenge on the crime-controlling Carlton Crew, and tries to increase his ever-expanding grip over the Melbourne crime world; whilst Jason Moran is in jail, his brother Mark takes control of the family business; Detective Steve Owen is determined to prove an underworld murder.

Lewis Moran hires Benji Veniaman to execute his son's, Mark Moran's killer. Subsequently, Veniamen is insulted by the Carton Crew and forms a dangerous alliance with their unpredictable rival Carl Williams; Steve and Jacqui's police instincts are tested when they try to disprove a murderer's alibi; when a criminal is shot dead multiple times, the Police realise there's a monster on the loose.

With their men in jail or dead, the women who love gangsters try to get on with their lives. With Carl Williams in prison, a rival crime boss tries to undermine his empire. A young lawyer falls for her client, a convicted killer linked to the Carlton Crew. The police make a major breakthrough in identifying the mystery hitman they know only as “Benji".

Amid growing public unrest, the police establish Task Force Purana to combat the gangland war. Loan shark Mario Condello faces his own financial crisis, which he solves with brutal efficiency. Bitter rivals Carl Williams and Jason Moran take out contracts on each other’s life. Taskforce Purana detectives are furious when police corruption derails their investigations.