Clara Humble thinks she might have superpowers. Which is convenient, because things aren't going so well for Clara. Students from a rival school are moving into her school for the term, and Clara's favourite neighbour, Momo, is moving to a retirement home. Together with her best friend, 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.