Mrs. Smith's Spy School for Girls Series by Beth McMullen, Kelsey Navarro

A girl discovers her boarding school is actually an elite spy-training program, and she must learn the skills of the trade in order to find her mother in this action-packed middle grade debut.After a botched escape plan from her boarding school, Abigail is stunned to discover the school is actually a cover for an elite spy ring called The Center, along with being training grounds for future spies... moreA girl discovers her boarding school is actually an elite spy-training program, and she must learn the skills of the trade in order to find her mother in this action-packed middle grade debut.After a botched escape plan from her boarding school, Abigail is stunned to discover the school is actually a cover for an elite spy ring called The Center, along with being training grounds for future spies. Even more shocking? Abigail’s mother is a top agent for The Center and she has gone MIA, with valuable information that many people would like to have—at any cost. Along with a former nemesis and charming boy from her grade, Abigail goes through a crash course in Spy Training 101, often with hilarious—and sometimes painful—results. But Abigail realizes she might be a better spy-in-training than she thought—and the answers to her mother’s whereabouts are a lot closer than she thinks… less

Shannon Hale’s Princess Academy meets Stu Gibbs’s Spy School series in the third book in the Mrs. Smith’s Spy School for Girls series.Abby and her classmates have all been invited to Briar Academy to participate in The Challenge, a prep school competition where teams compete for prizes and the glory of being the best of the best. While there, they figure out their nemesis, The Ghost, is using Briar as headquarters to plan a devastating attack on his enemies (a.k.a... moreShannon Hale’s Princess Academy meets Stu Gibbs’s Spy School series in the third book in the Mrs. Smith’s Spy School for Girls series.Abby and her classmates have all been invited to Briar Academy to participate in The Challenge, a prep school competition where teams compete for prizes and the glory of being the best of the best. While there, they figure out their nemesis, The Ghost, is using Briar as headquarters to plan a devastating attack on his enemies (a.k.a.: pretty much everyone) using a brand-new invention Toby developed. And this time, The Center and Mrs. Smith will be of no help as Abby suspects there is someone working for The Ghost on the inside—and they can trust no one. less