Shaking in the Shack: YaYa & YoYo, Book 2. By Dori Weinstein

Joel Silver (YoYo) loves to be a comedian and to play practical jokes. However, when he, his twin sister Ellie (YaYa) and the rest of their fifth-grade Hebrew school class find something surprising in the synagogue's sukkah just before the holiday of Sukkot, it's no laughing matter. Where did the mysterious four-legged visitor come from? What will become of it? Their unexpected adventure brings Joel and Ellie face to face with the importance of shelter and caring for those in need.