When Molly discovers that Rainy Day has made yet another mean decree, she gets so angry that she starts to feel hate. The Boxmaker shows up in a magic letter to teach her about empathy and the tragic story of a girl just like her who got lost and now lives in Rainy Day’s castle, alone and sad. Before the Boxmaker can send the letter, he gets captured by Rainy Day, leading the gang to prepare for a mission to save him–and Rainy Day herself.