The Book of Three is by Lloyd Alexander. The first book in The Chronicles of Prydain series. Taran is an Assistant Pig-Keeper. He is in charge of Hen Wen, the only oracular pig. When she escapes, Taran goes after her and finds himself involved in the adventure of a life time. Taran must find Hen Wen and find a way to warn the Sons of Don that the Horned King is about to attack and the kingdom is threatened by evil.
Ratings: 5th grade - 9 out of 10.