This story is about two girls who go into a castle and they unscramble some words to solve a mystery. Then they reach Bosk, an island on Hyperearth and it's really cool because there is a sorcerer named Sathon, who was evil.
Then the two girls set out on an adventure to stop Sathon from taking over Hyperearth. I enjoy stories that have girls as superheroes because it says that girls can do anything that boys can do.
The ending was awesome but I won't give away too many details about that. You'll just have to pick up this book yourself and find out.
This was a very long book, the longest one I've ever read, but it was exciting all the way through and I really enjoyed it. I would read more books by this author, but maybe not one so long.