The Dark is Rising by Susan Cooper (The Dark Is Rising Sequence #2)
VINTAGE PAPERBACK  SCHOLASTIC
Excellent vintage copy with just a touch of shelf wear to cover.
With these mysterious words, Will Stanton discovers on his 11th birthday that he is no mere boy. He is the Sign-Seeker, last of the immortal Old Ones, destined to battle the powers of evil that trouble the land. His task is monumental: he must find and guard the six great Signs of the Light, which, when joined, will create a force strong enough to match and perhaps overcome that of the Dark. Embarking on this endeavor is dangerous as well as deeply rewarding; Will must work within a continuum of time and space much broader than he ever imagined.