SPOILER ALERT
This installment of the series involves the combined investigation into prison smuggling. Drugs, mini cellphones and dozens of other items are being smuggled into the prison system, and the reduced manpower and resources have reduced the capability of the system to get a handle on it. DS Lydia Pillay believes that it is widespread problem, not just in Portland Prison and Guys Marsh Prison. The various leadership of the counties involved get together and pool their intelligence, including DC Jimmy Melson, DE Kevin McGreedie, DCS Matt Silver, Asst Commissioner Jim Metcalf, DC Rae Gregson, DS Barry Marsh, Sgt Rose Simons and PC George Warrander, Ameera Khan, Senior IT Tech to name a few. DC Andrea Ford appears to be involved in the criminal side and her DCId, Bruce Pitman, who had had an affair with her has let her have free rein in her job. The group is unclear if there are other CID officers involved.
There are some very scary white supremacist gang members who have threatened police and citizens who are believed to be involved. Some of these men appear to have been together in the Army before being discharged. They are Liam Fenners, Tonto Leary and Bill Mapps. An accountant Simon Osman is also suspected as he was the last to see the now missing Ford.
As the police step up their search for various men and the means for getting the supplies and then smuggling them in, several of the players are killed. Tony Quigley, Fenners and Ford. Fenners and his wife die in a fire that his son Danny and daughter Kerry barely escape. Danny has seen some of the men who came to the house. He has Asperger's and plays the saxophone. Lydia is pursued and beaten by Leary, nearly losing her life. The police take others into custody and let them know they could be next. Eventually one of them confesses and the head of the gang, Osman, who had been a major in the Army with some of the others is captured.