Poppy's house has always had at least one little foster-brother or sister. But when her mum announces they'll be getting a new foster-child, she isn't expecting it to be Sadie Shaw. Sadie is hard as nails, cold as ice, tougher than a tiger and she's the new girl in Poppy's class at school. They'd never be seen together in public. Now they're sharing a bathroom. Sadie and Poppy have a secret. They may not like each other, but their mums are sisters who haven't even spoken for years. But now Sadie's mum's disappeared, her dad's in prison and Poppy's mum is treating her like a long-lost daughter. How can Mum fall for Sadie's sweet-as-honey act when Poppy knows all too well what she's really like?