Gallagher Girls Books in Order

The Gallagher Girls series follows Cammie Morgan, a girl who seems perfectly ordinary in small-town Virginia until you notice how easily she disappears into a crowd. Cammie attends the Gallagher Academy for Exceptional Young Women, a boarding school that looks like a finishing school but secretly trains teenage spies.

Inside the stone walls, classes have names like Covert Operations, Culture and Assimilation, and Advanced Encryption. Cammie’s mother runs the school, her Aunt Abby is a legend in the field, and her best friends Bex, Liz, and later Macey bring their own mix of muscle, brains, and attitude. Together they juggle exams, late-night security drills, and the occasional mission that looks suspiciously like a pop quiz.

At first the stakes feel personal. In I'd Tell You I Love You, But Then I'd Have to Kill You, Cammie falls for a normal boy from town who has no idea she is a spy-in-training. Hiding her real life from him turns everyday dating problems into high-risk operations, and the tension between honesty and secrecy never really goes away.

As the series goes on, the tone deepens. A shadowy group known as the Circle of Cavan begins targeting Cammie and the people she loves. Attacks on her friends, questions about what really happened to her father, and missions that leap from Washington to London to Rome push Cammie far beyond school drills. Books like Only the Good Spy Young, Out of Sight, Out of Time, and United We Spy show the girls operating well outside the classroom, trying to stop plots that could tip global politics.

Through all the twists, the core of the series stays the same. Gallagher Girls is about friendship, loyalty, and how it feels to grow up fast while adults still underestimate you. Cammie and her friends argue, keep secrets, and make mistakes, but they keep choosing each other when it counts.

Readers who start with the main sequence can later loop back to The Spies That Bind, a prequel about Cammie’s very first year at the Academy, or to the crossover novella Double Crossed, which brings Gallagher Girls and the Heist Society crew together at one very dangerous gala. The result is a universe that feels big and lived in, full of secret tunnels, code words, and girls who are learning that being a spy is as much about heart as tradecraft.