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?