The second book in a funny and adventurous new series by a bestselling adult author and award-winning children's book illustrator. In this book, Abigail and John Templeton have moved with their father--Professor Templeton--to a school for performing arts--where the professor is charged with inventing a ground-breaking theatric device, and the twins (and their dog) once again find themselves having to thwart the dastardly Dean brothers in order to save the invention, their father and the dog.