Just a continuation of the first book, The Summoning. I think had these not been YA books, all three could easily have just been one book. But regardless, they are still enjoyable. I disagree somewhat about the covers--while the jewel included on each is a part of the story, it is very rarely even mentioned in the first two books. Perhaps it is more important in book 3, but still it doesn't quite belong on covers 1&2 in any case. Plus, I'm pretty sure Chloe is blonde...not exactly like the cover model. I wish publishers would choose their covers more wisely.