"I Want My Hat Back" is a children's picture book written and illustrated by Jon Klassen. The story follows a bear who has lost his hat and is determined to find it. As he asks various animals if they have seen his hat, the bear's frustration grows, leading to a surprising twist. The book features simple text and minimalist illustrations, making it accessible for young readers. Its themes of loss and determination, combined with a touch of humor, engage children while encouraging them to think critically about the bear's interactions with other characters.