I read this out of order, although I don't think it matters. This is technically book 3 of the trilogy of short books behind the scenes, so to speak.
Am I the only person who didn't realize Hogwarts was in Scotland?? How did I miss that?
This little book is a quick 79 pages of insight into Hogwarts and how JK Rowling came up with some of the things we all love. We learn more about the Hogwarts Express and Platform 9 3/4. Got some good info on the Sorting Hat and the 5 minute rule.
The castle itself was explored with the Hufflepuff Common Room, which we've never seen, and the Marauder's Map ("I solemnly swear I am up to no good"). Time travel is discussed via the Time-Turner as well as all the Castle residents - ghosts AND portraits!
Lastly, we get the secrets of the Castle. Very good background information!
I love these little books!