Spy School
by Stuart Gibbs
Twelve-year-old Ben Ripley gets recruited to a secret CIA spy school, but soon discovers that not everything is as it seems. He must use his math skills to uncover a mole in the academy before it's too late.
5th GradeSeries
About Stuart Gibbs
Stuart Gibbs is an American author who has written mostly mystery and humor books that are aimed for tweens and teens.
via WikipediaISBN: 9781442421837