Only the Good Spy Young by Ally Carter (Gallagher Girls #4)

Cammie is the target by the mysterious Circle of Cavan, an terriost organization of spies. After her former teacher, Joe Solomon, risks his life to give her a coded message, she goes a mission to find out why the Circle wants her and what her father and Mr. Solomon have to do with the organization. With the help of her super spy friends and her sort of love interest, Zach, Cammie sets out to find the truth. But the truth is harder to find than she thinks.

It's been a while since I got into this series. The third book didn't do it for me but I enjoyed this one. I think the time off (and the fact that it wasn't following up a fantastic book) helped. Cammie and her friends really step up their game in this book which is good because the ending is drawing closer (it's a 6 book series) and all the players are being set up for the finale. We learn a little more about the Circle and who is in it and that makes for some surprising moments. We don't learn why they want Cammie and not too much more about Cammie's father though it is implied that he is still alive. But the story moves forward at fun pace and I'm anxious to read the next one to see what happens next.

Gallagher Girls series
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