Lilly has waited for this day all year: It's Pegasus Camp! And it's finally here! But this year, Lilly's little sister, Filly, is tagging along. And wherever Lilly goes, Filly's right underhoof, turning rainbow leaping, mane braiding, and cake baking into crashing, tangling, splattering messes! When Lilly's temper finally snaps, Filly canters sadly away. Lilly wanted her Pega Sister to go--so why can she no longer have any fun without her? Anyone with siblings will knowingly smile and roll their eyes, and all readers will laugh along with this rollicking, punny summer camp romp, which also serves as a sparkling reminder that sisters make the most marvelous magic together.