Someone or some thing is stealing from the peaceful residents of Buttonville. But is the thief from the real world...or the imaginary one? Ben and Pearl are about to find out. When they report for duty at Dr. Woo's, Mr. Tabby hands them a bucket and a shovel -- for the collection and proper disposal of dragon droppings -- and directs the apprentices to the hospital's roof. Soon, they come face-to-snout with the dragon that lives there and find a pile...