In a terrifying future world of disaster and destruction, four girls must depend on each other if they want to survive. Louisa is nervous about being sent away to a boarding school — but she's excited, too. And she has her best friend, Maddie, to keep her company. The girls have to pretend to be twin sisters, which Louisa thinks just adds to the adventure! Country Manor School isn't all excitement, though. Louisa isn't sure how she feels about her new roommates: athletic but snobby Rosie and everything's-a-conspiracy Evelyn. Even Maddie seems different away from home, quiet and worried all the time. Still, Louisa loves CMS — the survival skills classes, the fresh air. She doesn't even miss not having a TV, or the internet, or any contact with home. It's for their own safety, after all. Or is it?