The Cleaner — Mark Dawson

Have you met Milton?

He's a problem solver. The man the British government calls on to take care of the worst of the worst: the enemies of the state that the Secret Service and the military can't stop. But years of covert identities and clandestine missions have taken their toll. Milton is troubled by nightmares and resolves to make his next job his last. Then, perhaps, he can start to make amends for everything that he's done.

Milton finds himself in the East End of London. A young mother needs his help to rescue her son from a life on the street. But the gang that has taken the boy in, and the charismatic criminal who leads it, are not about to cooperate with him. As London burns through summer riots, Milton finds himself in unfamiliar territory, dealing with an unfamiliar foe.

And when his employer sends another agent after him, the odds against him are stacked even higher.