Clara Humble may seem like your average fourth-grader who doesn't look before she leaps, but she has a secret: she thinks she might have superpowers. Which is convenient, because things aren't going so well for Clara. Students from rival R. R. Reginald are moving into her school for the term, and Clara's favorite neighbor, Momo, is moving to a faraway retirement home. Together with her best friend, Bradley, the winsome and overconfident Clara becomes convinced that her knack for making liquids spill, overhearing her parents' conversations, communicating with her pet chinchilla, and maybe even mind-controlling teachers could be used to put a stop to these injustices.