Best friends Georgie and Jem aren't just new at school; they're new at being full-time sisters too. Georgie's mum and Jem's dad have finally bought a house together, and they get to share a home at last, just like they always wanted. School is a bit more challenging. Miss Eagle wants the whole class to start a self-esteem project. They'll write their biggest secret on a piece of paper shaped like a cloud and then float them up into the sky on a balloon and their worries will disappear. Then disaster! The ball of secrets disappears instead! Soon everyone's deepest secrets are being revealed to the whole school.