On the first day of school, Saige makes two unwelcome discoveries. There are no art classes this year, and her best friend Tessa is taken up with another friend, and with music. "Do you want to try to do something about it?" Grandma Mimi, an artist and equestrian, asks. That leads to leading a parade, teaching Mimi's old horse some new tricks, and making a new friend while finding ways to keep the old.