When Poppy Song joined Mrs. Z's third-grade class at Curiosity Academy, she knew just how to connect with her classmates: baked goods. Her beloved grandmother Po Po used to own her own bakery, and Poppy has inherited Po Po's gift for making pineapple buns, egg tarts, and other sweets. After her classmates hear about a fancy treat called Dragon's Beard candy, they can't wait for Poppy to make some and bring it in. Poppy is excited to try to make the candy, but she has other worries on her mind as well. Ever since they moved to Peppermint Falls, Po Po has been acting differently, putting items back in the wrong places, even mixing up ingredients in the recipes she knows by heart. Poppy wonders whether to say anything about these changes. Then comes a day when the differences put Po Po in danger, and Poppy must find her own courage to help her grandmother and her family figure out a way forward.