Seth is at it again. After ignoring his grandfather's wishes not to deal with the satyrs, Seth is heading out for a secret meeting with Doren and Newel. Batteries are to be exchanged for gold, and all that Seth has to do is accompany the satyrs and pillage one of the nipsie's Seven Kingdoms. It's not supposed to be too hard seeing as the nipsies are only about an inch tall and have no real defenses. Everything is going according to plan when it is apparent that the ever peaceful nipsies aren't so peaceful anymore. Something has befallen two of the Kingdoms. The nipsies themselves are claiming allegiance to a new master, and have changed in appearance. The dark nipsies have grey skin, blood red eyes and fangs. What can this all mean?
Meanwhile, Warren and Tanu are returning to Fablehaven after trying to find out if Vanessa's accusation of the Sphinx is true. It turns out that all over the world at different preserves, dark creatures are overturning the light. The Knights of the Dawn are supposed to be having a united gathering in an effort to overthrow the Society of the Evening Star, and the big news is that the Captain wants to induct Kendra. Her grandparents are upset, because knighthood pretty much guarantees even more danger than Kendra faces at Fablehaven.
Seth is so jealous he can hardly stand it. Now Kendra gets to go off on more adventures and he is stuck under orders not to go into the woods at Fablehaven. However, it doesn't take long for there to be quite a bit of action on the preserve. The nipsies aren't the only ones choosing the dark. Soon there are dark fairies who are not fallen like the imps, and while humans who are infected do not necessarily turn dark, they certainly disappear.
While this is going on, Kendra (under the supervision of Warren) has travelled to Lost Mesa with the charge of locating a magical artifact and giving it to the captain of the knights. The problem is, of course, the fact that no one really knows who the captain is. Could the Captain be working for the Society of the Evening Star?
In true Brandon Mull fashion, this third installment is fast paced and action packed. By taking some of the action from Fablehaven and bringing it to Lost Mesa, the reader sees the different cultures of the different preserves, and is allowed access to even more magical creatures. I do have to say that I am feeling a bit of Jackie Faber syndrome here. I expected a wrap up with Shadow Plague, and while it continued the journey, the story is not over. We have ended with another cliff hanger, and I am a bit sad about this. That said, I am left happy about the introduction of Gavin, the deeper story surrounding Patton, and a bad taste in my mouth regarding our friend Warren. Maybe next go round, I will see if my suspicions are true!