The small island of Sark in the English Channel is the last feudal government in Europe. By law, no motor vehicles run on the road, and no lights burn at night. Only the lord of the island may keep hounds.Into the strange, high house of Wrongerwood wanders Hal Landfall, penniless graduate student at Magdalen College, looking for his missing friend Manfred Hathaway, who has just inherited the lordship, the house, and the island. What he finds instead is the lovely, green-eyed Laurel, a beautiful girl from Cornwall who is Manfred's wife-to-be.

There is said to be a haunted chamber in the house, erected by Merlin in ancient days, where a man who enters remembers his true and forgotten self. When Hal and Laurel step in, they remember, with fear and wonder, a terrible truth they must forget again when they step outside.