The third and the final ebook based on the material from Pottermore. This one has 19 (very) short stories about anything and everything that is Hogwarts - you will find out more about Hogwart's grounds, different creatures that dwell there, some of its history & of course some of its secrets.
The most intriguing part of the book - a chapter that details how a magical portrait is created and specifically how past headmasters' portraits are created. It is fascinating to see how much thought & attention to detail JKR had put in while creating even the smallest of the things of her fantasy world.
4/5 like the previous two Pottermore ebooks. Potterhead junkies will enjoy it. One downside, leaves you wanting more !