The Invisible Tower is an exciting, suspenseful thriller. I didn’t want to stop reading it. If you liked the brother-sister relationship of John and Philippa in The Children of the Lamp series by P.B. Kerr, you will enjoy the interactions between Artie and Kay. And if you liked how Rick Riordan made his Percy Jackson series exciting by using Greek and Roman mythology, you will enjoy how Nils Johnson-Shelton makes the first book in his series exciting by using the Arthurian myths. I can’t wait for the next book!