"The Four-Story Mistake" is a children's novel written by Elizabeth Enright. It tells the story of the Melendy family, who move to a new home in the countryside. The family consists of four siblings: Rush, Mona, Benny, and Oliver, who embark on various adventures as they adjust to their new surroundings. The title refers to a significant event in the story where the children discover a four-story house nearby. This discovery leads to exciting escapades and valuable lessons about friendship, family, and the importance of home. The book captures the essence of childhood exploration and imagination.