When Alma lands the starring role in Uncle Nestor's musical, she throws herself into becoming the best subway conductor ever. But when her friends don't seem happy with her hogging the spotlight, Alma's got to figure out where the train ran off the tracks. It's Alma and Harper's very first playdate! The girls have an ah-may-zing time making a puzzle and playing a clean-up game at Harper's house. But when Alma takes Harper to her house for dinner, Harper isn't having as much fun. Can Alma figure out why Harper isn't herself?