Nightmare - Stephen Leather

What goes around comes around. Jack Nightingale learned that as a cop and discovered that it was just as true in the world of the supernatural. His life changed forever on the day he failed to stop a young girl throwing herself to her death. Ever since, he's been haunted by thoughts that he could have done more to save her. Now her cries for help are louder than ever. Is she trapped in eternal torment? Or are the forces of darkness torturing and deceiving him in order to regain the ultimate prize - his soul? Nightingale will have to face down the powers of the police, south London gangs, and Hell itself to find out. And evil is closer than he thinks...