When you're an ex-cop and an ex-doper scratching a living as a private investigator in the unromantic streets of south London, you take any work you can get. Even a dreary little debt collection job for some toe-rag of a used-car dealer. When Nick Sharman collects the money due on a classic Bentley, though, he finds himself stepping into another world. A world where a reclusive rock musician in a secluded mansion complete with its own recording studio—and firing range—broods on the royalties stolen from him by a crooked management—and decides Sharman is just the guy to get them back. Taking the job could be the worst mistake of Sharman's disaster-ridden life. And when rock 'n' roll's godfathers take on the Mafia, south London explodes in a maelstrom of violence.