"The Wall in the Middle of the Book" is a children's picture book written by Jon Agee. The story features a character who lives in a world divided by a wall, which he believes protects him from dangers on the other side. As the narrative unfolds, the character discovers that the wall is not what it seems. The story explores themes of perception, fear, and the importance of understanding what lies beyond our immediate surroundings. Through engaging illustrations and simple text, it encourages young readers to question their assumptions and embrace curiosity.