These books were amazing. The first book was a little light, but the books get way better. Ally Carter is a genius for being able to produce such amazing books. The girls in the book are so strong, brave, and independant. The boys in the book get more and more important as it goes along, that's something that i like about the books alot. They're very mysterious too. There are 4 books in all, 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, Only The Good Spy Young. An amazing serious about hilarious, dangerous, mysterious missions. Definetly a great read.