by Michael Grant (Author)
Oh! But they do! (Or at least, this one does. We can't speak for any other ancient, magical languages.) Mack, Jarrah, Xiao, Dietmar, and Stefan travel to Europe to find the Key, an engraved stone that unlocks the power of Vargran. But can they locate the invisible castle of William "Blisterthong" MacGuffin, who guards the Key?
Mack has less than thirty days to master Vargran, round up the rest of the Magnifica, and defeat Princess Risky. Will the Key be enough? Or is there something else Mack must find in order to save the world?