Title: Over Sea, Under Stone (The Dark Is Rising #1)
First published: May 1988
Description: On holiday in Cornwall, the three Drew children discover an ancient map in the attic of the house that they are staying in. They know immediately that it is special. It is even more than that -- the key to finding a grail, a source of power to fight the forces of evil known as the Dark. And in searching for it themselves, the Drews put their very lives in peril. 
This is the first volume of Susan Cooper's brilliant and absorbing fantasy sequence known as The Dark Is Rising.
Subjects: Adventure stories, Brothers and sisters, Cornwall (England : County ), Fantasy, Fantasy fiction, Ficción juvenil, Fiction, Hermanos, Juvenile fiction, Magic, Novela fantástica, Large type books, Good and evil, Archaeology, Buried treasure, Mystery and detective stories, Children's fiction, Cornwall (England), Cornwall (england : county), fiction, Magic, fiction, Brothers and sisters, fiction, Stanton, will (fictitious character), fiction, Siblings, fiction
Places: Cornwall (England : County), Cornwall (Inglaterra : Contado), Cornwell (England, County), England, Fantasy., Fantasy
People: Barnabas Drew, Jane Drew, Simon Drew