Broken Promises — Stephen Leather

London is under siege - not by criminals, but by a new breed of vigilantes. Cops, crooks, and businessmen alike are taking the law into their own hands, punishing those they feel have escaped justice.Streaming their crimes online while wearing latex masks of famous politicians, they gain millions of viewers, and an unstoppable sense of power. When judges and lawyers become their targets, the country teeters on the edge of chaos.The police are powerless. There's only one man who can stop the spiral . . . Dan Spider Shepherd.