Only The Good Spy Young is the fourth book in the Gallagher Girl series. The series revolves Cammie "The Chameleon" Morgan, a spy in training at Gallagher Academy - a school for spies under the cover of a boarding school.
The books in the series seem to be getting progressively more serious, from missions for Covert Ops class to being targeted by a terrorist organisation. Only The Good Spy Young had more action and suspense than the books before it, and was as captivating as the others.
When reading a series, I usually find the characters flat, with not much development past the first book. The Gallagher Girls series is an exception to that, with Cammie and her friends becoming stronger and more independent as the story progresses. They're all likable, loyal characters, each with their own quirks.
The mysterious Zach makes more appearances in this book, and we learn more about his background. Instead of just popping up to warn Cammie, he fights beside her and her friends. Cammie and Zach's relationship is tested but still grows, and it becomes more romantic in this installment of the series.
The plot, like the other books in the series, is compelling. It's unpredictable, suspenseful, and puts in the characters in all kinds of tight places that take no small amount of work to get out of. A lot of mysteries from previous books become clearer, and loyalties are tested.
This books ends on the biggest cliffhanger of the series, and also has the biggest wait so far until the next book. I can't wait to see what happens next.
I give Only The Good Spy Young a 5 out of 5.