From the dust jacket:

“'Asta’s Son' is all he’s ever been called. The lack of name is appropriate, because he and his mother are but poor peasants in fourteenth-century medieval England. But this thirteen-year-old boy who thought he had little to lose soon finds himself with even less - no home, family, or possessions.

"Accused of a crime he did not commit, he has been declared a 'wolf’s head.' That means he may be killed on sight, by anyone. If he wishes to remain alive, he must flee his tiny village. All the boy takes with him is a newly revealed name - Crispin - and his mother’s cross of lead.

"The Newbery Medal Winner."