Castle of Wizardry is by David Eddings. The fourth book in The Belgariad. Garion and his group have retrieved the Orb and must return it to the Hall of the Rivan King. There Garion discovers his true identity and learns the truth of his destiny. Fans of this series will not be able to wait for the final installment.
Ratings: 8th grade - 9 out of 10 - V (violence).