It is Scotland in the early 18th century. Fear and superstition grip the land. Robert Wringhim, a boy of strict Calvinist upbringing, is corrupted by a shadowy figure who calls himself Gil-Martin. Under his influence he commits a series of murders which he regards as "justified" by God under the tenets of his faith. Hogg's book is a brilliant portrayal of the power of evil, and a scathing critique of the organized religion. Superbly crafted and deftly executed, it resists any easy explanation of events; is this stranger a figment of Robert's imagination or the devil himself?