We Are in a Book

We Are in a Book! is a children's book by Mo Willems, part of the popular Elephant & Piggie series, published in 2010, where best friends Gerald the elephant and Piggie discover they are in a book and interact with the reader, leading to a humorous and clever story about the book's ending. The book is known for its simple, engaging text, vibrant illustrations, and its meta-narrative that breaks the fourth wall, making young readers part of the story.