I know the perfect books!! The series is called Gallagher Girls, and it is about girls that secretly go to a school for spies. the main character meets a boy that isn't a spy, but they fall in love and it's really hard to keep her secret. There are two books so far, and a third is coming out soon. The first is "I'd Tell You I Love You, But Then I'd Have To Kill You. The second is "Cross My Heart And Hope To Spy" which is a has a different story line than what I explauned above, but It has a new boy instead that is a spy too. The third book is "Don't Judge A Girl By Her Cover" which I don't think is out yet.