Harriet's continuing adventures.
She departs home after a short visit that feels long, and finds that Wilbur is frantically riding in search of her: his hydra Heady's egg has been stolen!
She arrives on the scene and finds a clue. And shortly thereafter, she and Wilbur set out. In a story involving a letter from Wilbur's mother to an old friend from school, the Forest of Misery in the Kingdom of Sunshine, lots of cookbooks, chalk, trees carved into the shape of people and animals, sad stories, Harriet's wishing she were invincible again, and more.