John Mercer is ex-Special Forces serving a double life sentence for the murder of his aunt and uncle. It was a crime he committed out of revenge for the years of physical abuse his sister Jess suffered at their hands. He is awarded an early release from prison on the condition that he becomes an assassin for the government.
The first of a two-part story, the second season opener finds the team battling a ruthless street gang that traffics in more than just drugs. Lenny is concerned about the future of his underground crime-fighting crew and faces a threat to his authority from within MI6.
The team continues to work on breaking up a paedophile ring. Assistance offered by an MI6 operative seems to involve ulterior motives.
The team are assigned to stop a drug dealer whose Afghan operation has cost the lives of some British servicemen there. The battle becomes very personal for Mercer who must overcome an injury in his determination to bring the man down.
Rose is stalked by the man who got her thrown off the police force. Innocent bystanders may end up drawn into a cat and mouse scenario as the crew attempts to deal with a rapist & murderer before he escape justice again.
The team find themselves involved in the world of cage fighting when they try and deal with a gang plotting a major heist.
A hitman from India arrives in the UK with the intend to kill a ten month old baby who is the heir to a large fortune. Mercer and the team have to work to protect the child and stop a mob war from breaking out. Symmonds attempts to destroy the team which leads to repercussions.