This book was fantastic! It fills in the gaps from the Belgariad, Mallorean, and Polgara the Sorceress. They go in that order, then finish with Belgarath, so this book wraps up all the loose ends and fleshes out the lives of the main characters.
The originality of this book (and the entire series) is impressive. I highly recommend it. It's a great read and well worth it.