Only the Good Spy Young

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Only the Good Spy Young is a 2010 young-adult fiction novel by Ally Carter, and the sequel to Don't Judge a Girl by Her Cover. It is the fourth book in the Gallagher Girls series. The book was released on July 29, 2010, but the title had been announced and the cover released on December 25, 2009. Ally Carter posted "mini excerpts" of the book on her website in the lead-up to the release.