The nameless / Ramsey Campbell.

Reprint. Originally published in 1981.

"Barbara Waugh's daughter, Angela, was kidnapped at the age of four, and when a badly disfigured body turned up, that appeared to be the end of the matter. Now, years after her daughter's disappearance, Barbara seems to be getting her life back in order . . . but then she receives a phone call from Angela. And then another. Barbara is convinced her daughter is still alive. Her investigations take her into the backstreets of London, where she hears about a cult composed of members who have no names. The more Barbara understands, the less she feels she can trust, including the people closest to her. As she follows the trail deeper into the darkness, will Barbara herself succumb to an evil so murderous it might not even be of human origin?" --