Years before Father Lankester Merrin helped save Regan MacNeil's soul, he first encounters the demon Pazuzu in East Africa. Merrin's initial battle with Pazuzu leads to the rediscovery of his faith.

Good policing doesn't necessarily mean doing everything by the book. But as the business of crime in London turns to favour the Albanians and Turks, how does a "good" policeman survive?