After saving the faeries of Skemantis, magician's apprentice Felix Carmer III and faerie princess Grit are eager to leave Grit's home city behind and see more of the world. Their travels soon bring them to the ticket counter of the mysterious Rinka Tinka's Roving Wonder Show. The flying circus delights and amazes, but the two friends quickly discover that there is more to the show's magic than meets the eye and that a string of local airship accidents might be the key to unlocking its darker secrets.

Fans of the Wildwood trilogy and Lockwood & Co. series will love the thrills and chills of The Crooked Castle as it takes readers from the heights of a magical flying circus to the depths of an underwater faerie kingdom and beyond.