Book details
Over Sea, Under Stone
The Dark Is Rising, 1977 by Susan Cooper
on Goodreads (34,619)
Description
Three siblings, Simon, Jane, and Barney, are on holiday in the fictional village of Trewissick when they discover an ancient map in the attic of the house that they are staying in. The map leads them on a quest for a grail, a quest that is fraught with danger, for there are others also in search of the grail who are prepared to kill for it.