Egads, this was a terrible book. I found and enjoyed the first four books in this series in the library my late teens, just before the last four were released...so I somehow missed all the interim books. If they're all like this no wonder.
The half-fantasy, half sci-fi premise works when it's in a pseudo-medieval setting, but the space stations and planetary colonies that Stasheff imagines are pretty lame in closeup, and the fact that he over explains every little thing doesn't help. Seriously--half of this book could disappear and it would STILL be too wordy and boring.
The new characters are one dimensional, the characters we know are boorish, uninteresting and inconsistent by turns and I miss the presence of the Gallowglass kids.
There's a plot and a very labored set up for all of this, but I'll skip explaining it here because if you've gotten far enough into the series to be on this book, you already know it. And if you haven't--then don't read this book! Go back and start with The Warlock In Spite of Himself, which is interesting and far better written than this.