What a scary story, like a modern Dracula but completely original in its concept and chillingly realistic in its narration. Avram Davidson was one of the finest writers the fantasy field has had, endlessly inventive and uniquely vivid. Grania Davis has completed this work, which he left unfinished, in a way that does him proud. - Poul Anderson

The Boss in the Wall is a last powerful and major work by a major and powerful author. - Gregory Benford

It is hard to imagine the genre that could encompass him; it is even more difficult to imagine fantasy or science fiction without him. - The Encyclopedia of Science Fiction