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Only five years into his life sentence for killing his aunt and uncle, a crime committed when he discovered their abuse of his sister, John Mercer is released from prison. He’s introduced to Lenny Douglas, a police officer “retired on grounds of ill health.” In fact, Lenny is an operative whose remit is to take down those members of the criminal and official establishment who think they are above the law. His task is to bring order where the law has failed. Mercer’s freedom comes at a price. He must use the skills he gained serving in the Special Forces to remove untouchable criminal Jacob Gould who was responsible for a hit on a senior police officer. Mercer is put in a south London council flat with Calum MacKenzie. Calum is an old cellmate and annoys the hell out of Mercer. He is an irrepressible bundle of deviant energy whose main interests are girls, drugs and ‘slamming tunes.’ But, to Lenny, Calum is an invaluable snitch and expert breaking-and-entering man.

Following the death of the head of a notorious crime family, Lenny visits his successor, the police mole Jude Cassidy. Lenny wants to persuade him to come under police protection. Jude and an accomplice have recently been acquitted of the murder of a young black man whose cousin, Elviss Gilroy, is making plans to avenge his death. Reluctantly, Jude agrees to go into hiding, under the protection of an even more reluctant John Mercer. Leaving Calum to watch over Jude, Mercer goes to visit his sister Jess. Cooped up in the little council flat, it takes no time for Jude’s true nature to emerge and he starts taunting Calum about his mother. Mercer gets a call from a hysterical Calum, who has lashed out at Jude with terrible consequences.

Lenny is alerted to the recent arrival of a notorious Albanian gangster Tarek Sokoli. Sokoli wants to put down roots in his new homeland and that includes running drugs and prostitution rackets. Rather than have him killed, Lenny instructs Mercer, Rose and Calum to scare him away - to send the message to any others planning on setting up in London that their attempts will fail. He wants them to work as a team. Calum frees the prostitutes that Sokoli’s crew had illegally shipped in by returning their passports. However, after one of the liberated girls is killed, and a heroin importer is murdered by Sokoli’s lieutenant after Mercer convinced him against doing business with the Albanians, the unit begin to realise that simply executing Sokoli would have created far less bloodshed.