Ally Carter is the New York Times best-selling author of the four previous books in the Gallagher Girls series: I d Tell You I Love You, But Then I d Have to Kill You; Cross My Heart and Hope to Spy; Don t Judge a Girl by Her Cover; and Only the Good Spy Young; as well as Heist Society and its sequel, Uncommon Criminals. Ally lives in Oklahoma, where she is cooking up new adventures for the Gallagher Girls. Visit her at www.allycarter.com.