Spy School by Stuart Gibbs

A twelve-year-old misfit is unexpectedly recruited into a top-secret spy training academy, where what begins as an exciting adventure turns dangerous as he faces rigorous training, mysterious classmates, and a possible mole inside the school. Unsure whom to trust, he must rely on his curiosity, humor, and improvisational smarts to uncover the plot and stop a real-world threat while discovering what being a spy truly demands.

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