In the town of Squashbuckle, just about anything can happen, and when Henry Penwhistle draws a mighty Chalk Dragon on his door, the dragon does what Henry least expectsit runs away. Now Henry's art is out in the world for everyone to see, and it's causing trouble for him and his schoolmates Oscar and Jade. If they don't stop it, the entire town could be doomed! To vanquish the threat of a rampaging Chalk Dragon, Sir Henry Penwhistle, Knight of La Muncha Elementary School, is going to have to do more than just catch his arthe's going to have to let his imagination run wild. And that takes bravery.