We meet Stuart pressed against a rainy window, worried and bored. Worried, because hundreds of things could go wrong in a new house, a new town, a new school. Bored, because he has no one to play with and because his collection of Valuable Things disappeared during the move. He really needs an adventure.In one fateful moment, it all becomes clear: Stuart realizes that in order to have adventure, he needs a cape! After all, don't all those superheroes have capes? Each day the cape brings a different and unexpected adventure. He entertains a gorilla, a horse, and a dinosaur in his bedroom.