Night-World is a novel written by Robert Bloch. It was first published in 1972.
Description[]
Robert Bloch, the creator of Psycho, takes you into the inner recesses of the mind of a madman. A man bent on revenge that comes out of the night, grabbing its victims by the throat and giving no quarter¨. From the moment Karen Raymond entered the sanitarium, she knew something was terribly wrong. The doctors had been brutally murdered; the patients had escaped. Was she to be the next victim?