Detective Inspector Ray Ennis doesn't believe in evil. He certainly doesn't believe the claim of a serial killer that all his victims were members of an evil cult and that an abomination lurks beneath the glittering skyscrapers of the City of London, but......when a dismembered torso with evidence of ritual sacrifice washes up in the Thames, Ray quickly finds his professional and personal lives unravelling. Elizabeth Russell, a 'Regulator' from the Treasury, seems intent on blocking his investigations, while his daughter, Chloe, is plagued by screaming nightmares that are seeping into reality. And who is the old man in the trench coat, who always seems to be nearby, watching Ray's family and seething with hate?With the emerging truth challenging his beliefs and his sanity, can Ray put the pieces together before darkness and chaos overwhelm his family? Is there something truly malevolent in the heart of London? And if there is, how can he confront it?