The Book of Mysteries is at it again. And the boys are about to be carried off on another adventure to save that girl, Lizzy. But it turns out, it's not only Lizzy who needs saving this time. The entire world of Feyborn and even the Earth are in danger from a great evil. Can Charlie, Rafe, Dash, and their dogs stop Arabelle and the evil, dark wizard she plans to free from his captivity? Are the children from Earth the heroes of the Feyborn prophesy?