The Dragonslayers

In Bryce Coville's The Dragonslayers, a brave squire, an earnest page, and a strong-willed princess set out on their own missions to slay the dragon created to carry out a witch's revenge.When Grizelda decides to get revenge on King Mildred, she doesn't go halfway. She makes the fiercest dragon the kingdom has ever seen. Now, someone has got to kill the thing. But the knights are too frightened, which leaves the job to an old squire, a young page boy, and the most willful princess who ever strapped on a sword. The question is, can they stop arguing long enough to face the greatest battle of all?