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.