The culmination of the story is a trip to a dragon sanctuary to try to get a final key. The concluding chapters are impossible to put down. Mixed with the suspense are some great laugh-out-loud bits of humor. Things are relatively contained, but this is all clearly the middle step in an adventure.
Things are getting weird at Fablehaven. There seems to be a plague of darkness. People and magical creatures are turning dark. It will take some special magic to get things back to normal. Meanwhile, there is a quest to find other missing artifacts to protect a prison. Things do not go so well. However, they do bring back a person from the past to help in the quest to free Fablehaven from evil. They also get some more clarity on who is on the good side - but then get more confusion as well. There is plenty to look forward to in the next book.