Donal MacIntyre meets Paul Grimes, a former gangster who turned informer on two of Liverpool's major drug barons after his eldest son died of a heroin overdose. He talks about how he got close to John Haase and Curtis Warren in order to gain evidence against them. Also considers the role of Michael Howard MP, who when he was Home Secretary gave John Hasse a royal pardon, only for the latter to begin reoffending almost immediately.