Jesika is four and a half. She lives in a flat with her mother and baby brother and she knows a lot. She knows their flat is high up and the stairs are smelly. She knows she should not draw on the wall where the wallpaper is peeling or touch the broken window. And she knows she loves her mummy and Toby. She does not know that their landlord is threatening to evict them and that Toby's cough is going to get much worse. Or that Lauren, her new best friend, has a secret that will explode their world.