If you are going to buy it for your library, you’ve got to be prepared to buy the whole series, and warn your patrons that this is most definitely the kind of series that one really needs to read in order.  This book alone does not stand on its own feet — it’s more like a mid-season episode of a TV series.  The reader who picks this up to read without having read the earlier books must constantly work at piecing together what’s going on, always well aware that there’s more they don’t know.  That being said, the action is good, the themes of good v. evil (and trying to figure out which is which) are good, the characters seem likeable (though not terribly well-developed in this title alone).