It was okay.
"I was hoping it was going to be a bit more Encyclopedia Brown-ish than it was. It wasn't exactly clues you could put together to figure out the plan and who was behind it. While the culprit was way too obvious, the existance of a flying dragon ship was too out there to figure out from the hints given. Also, we never got the last 4 pieces to the letter and then, there it was, all together in the back of the book. My son had been assembling it piece by piece, book by book, and had the fragments on his wall. I had to copy the finished letter from the back of the book, then trace the last 4 pieces as best I could and cut up the copy so he could finish putting it together himself, but Thayer was after he saw it in the book. It was disappointingly anticlimactic after getting one piece at a time and waiting so long, just to have the end spoiled for him when he turned the page."

