Cross My Heart and Hope to Spy is by Ally Carter. The second book in the Gallagher Girl series. Camie and her friends at the Gallagher School for Girls have been invaded, by boys. Boys from the Blackthorne Institute. Girls and boys training together to be spies; there's a prescription for trouble. When a top secret list is stolen from the school the girls must decide if they can work together with the boys, or if the boys can even be trusted. A cute sequel in a charming series girls will enjoy.
Ratings: 6th grade - 7 out of 10.