Philomena and her big sister Helen love building miniature cities out of books, toys, and household objects. When Helen begins seeing a new boyfriend, Brandon, Philomena's world falls apart. Even worse, she's expected to make friends with Brandon's son, Lucas: the most annoying boy in the world. Forced to share her perfect life with Helen, Philomena retreats into building the biggest tiny city ever: a magic city only for her. Then, one night, Philomena's city of found objects comes to life, and she finds herself trapped inside. Will Philomena find her way out—and will she let her new family in?