Gallagher Girls: Cross My Heart and Hope To Spy - Ally Carter

The second book in the million copy selling Gallagher Girls series set at an elite boarding school for spies. Perfect for fans of XO, Kitty.A Gallagher Girl's real grades don't come in pass or fail - they're measured in life or death.This semester at Gallagher Academy, Cammie is through with lying and sneaking around. At least, outside of classes. But when she's blamed for a security breach, Cammie might have to do a little sneaking to clear her name, starting with the mysterious group of guests staying at the school - code name: Blackthorne.