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In a terrifying future world, four girls must depend on each other if they want to survive.Now that best friends Louisa, Rosie, Evelyn, and Maddie know the truth -- or at least the danger theyre in -- the girls have run away from their safe country retreat. But life is riskier than ever, and Rosie still doesnt know who she can trust. Rosies survival skills are top-notch. But how well can she keep her own secrets?