I love this book because I like knights and Jack and Annie are in a magic tree house. I also love the other books that Mary Pope Osborne writes and I like the dragon book.
My favorite character is the Knight because he is really Morgan Le Fey. It takes place in the old times. I think that I like Knights because I love ninjas and samurai. Also, knights have swords and I love swords. I really like samurai because they have good swords and cool helmets and armor. Knights also have cool armor.
I would recommend this book if you like knights in medieval time and mysterious adventure books.