The Gallagher Girls Series

by Ally Carter

Books in this series:

1. 1I'd Tell You I Love You, But Then I'd Have to Kill You
2. 2Cross My Heart and Hope to Spy
3. 3Don't Judge a Girl by Her Cover
4. 4Only the Good Spy Young
5. 5Out of Sight, Out of Time
6. 6United We Spy
7. +Double Crossed: A Spies and Thieves Story