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In an alternate war-torn universe, twelve-year-old Mathilde takes a test to qualify for a secret (seemingly sinister) military operation, which necessitates leaving her family and best friend, perhaps forever. She unexpectedly passes and is sent to an idyllic Bletchley Park–like organization for brainy kids. The plot unfolds clumsily, but Mathilde's struggles and her sympathetic personality carry readers through to a cliffhanger ending.