Illustrated in full color. Siblings Seymour and Opal get along pretty well--until the day Seymour starts charging Opal five cents every time she passes through his room into hers. When Opal runs out of nickels, she decides to teach her brother a lesson--and before she's through, Seymour realizes that his sister is worth more to him than a whole piggy bank full of change. In the tradition of the best books about childhood challenges, Nicole Jussek's charming storytelling and Ana Lopez Escriva's adorable bunny-rabbit characters provide just the right mixture of humor and reality to show that it's more fun to be friends than foes.