Having had my expectations raised slightly by the second book, I started this one. I realized what people meant when they said it was gripping. Yeah, as in gripping the edge of a toilet seat when you have the flu.
Let's start with the basics. The antagonist--though it's hard to tell in the beginning if Austin is the antagonist or not, based on his disgusting behavior--is flat and boring. Austin, again in tis book, gets things made easy for him without having demonstrated anything heroic--actually after having demonstrated the contrary--that he is completely unfit for being a decent human being at all, let alone a hero.
For those who will say Klavan was demonstrating how a person can fall into sin and be restored ,no. I get that and I've seen dozens of literary depictions of this (for a great recent example, see Andrew Peterson's story of Peet in the Wingfeather Saga). In "Another Kingdom", there was no repentance, there were no consequences, no acknowledgement at all of horrific sin.
Klavan needs to take a lesson from Anthony Hope in what being a real man means--cue Rudolph Rassendyll--and how to write one of the best villains in literature--cue Rupert.
Three final points.
1)There's a supposedly major plot twist (though totally boring) in which Austin finds out that he actually didn't make it out of the maze in the last book, because he didn't ultimately refuse the evil choice offered to him by the antagonist. Klavan tries, feebly, to insist that Austin still wanted to do the right thing in spite of not refusing the evil choice. This is in direct contradiction to basic human psychology and common sense, which is this rule--you do what you want to do. See Romans for a more through treatment of the subject.
2)Klavan again delights in describing women in the nude. Near the end, he describes the transformation of a character from an animal back to woman. This is magic. The author makes the rules. So he made theses rules. And insists on transforming her first in to the nude and describes Austin ogling her (knowing she is engaged, if that means anything), and then he finally decides to magic her clothes on. What a jerk.
3) Finally, as soon as the name Anastasius was introduced, I knew where the plot was going. I'd be very interested to see if other readers also saw this coming. I could tell for two reasons. 1) the obvious meaning of Anastasius as "resurrection" and 2) Klavan's glaringly obvious predilection to give Austin totally undeserved powers and roles. So, really, the only question was, how as Austin going to become the Emperor? And yes, I was right. He did become the emperor.
Ok, last thing. I haven't even mentioned the feeble way he tries to keep the audience on cliffhangers as he splices back and forth between worlds. There are multiple plot holes here, and I didn't even bother remember them all, since the issues of character development and morality (or lack of them) as a much bigger issues to me.
Overall, I would give this a negative three like the first one. It's truly sad that this is what goes for a bestseller written by a self-proclaimed Christian nowadays.