Gallagher Girls: Don't Judge A Girl By Her Cover: Book 3
Ally Carter
Here’s the thing about covert operations: the really bad things always happen when you least expect them. The enemies don’t give you a heads-up. And they never let you stop to put on comfortable shoes.
A spy-in-training, Cammie Morgan has a cover for every occasion. But what happens when she is forced to lose her cover to save her best friend, Macey? Cammie and her friends are determined to hunt down the group that threatens to tear their secret sisterhood apart. This time it’s personal.
Reviews

I've read the next book in the Gallagher series and Blackthorne is not just a spy school for boys.
Principal Nectarine Birdbath 11.08.2021

Best one in the series
Anonymous 18.08.2018

A very exciting and fast-paced book; I couldn't put it down! I would recommend this book to children aged 12+.
Anonymous 06.08.2017