Welcome to London's underworld where cops don't deal, criminals don't bargain and crime bosses don't negotiate. Meet Mark Hammond and Frank Carter; one's a former gangster and convicted bank robber, the other a vigiliante cop. They're two men on opposite sides of the law but joined in their obsession to bring down London's crime supreme - Charlie Jolson. Jolson's reigned London's streets for 20 years, but out here no one stays on top forever.