Enroll with Cammie
Start with I'd Tell You I Love You, But Then I'd Have to Kill You and continue in order through the complete mission arc.
Book Series · 6 Books
Gallagher Girls Books
In order from I'd Tell You I Love You, But Then I'd Have to Kill You to United We Spy.
Cammie Morgan attends an elite boarding school for spies, where classes in covert operations are only the beginning of a six-book story about friendship, family secrets, first love, and dangerous field missions.
Reviewed by the Bookroo Editors Updated
Reading order
How to Read the Gallagher Girls Books
Read all six novels in publication order, beginning with I'd Tell You I Love You, But Then I'd Have to Kill You and ending with United We Spy. The early school comedy gradually becomes a continuous espionage conflict, and later revelations depend on earlier books.
The Spies That Bind is an optional Audible prequel novella, not a missing seventh novel in the print sequence.
Sources: Ally Carter's official Gallagher Girls book list, Ally Carter's United We Spy page.
For parents
What Parents Should Know
The first books lean into boarding-school friendship, crushes, and playful spy training. The series becomes notably darker, with stalking and terrorist threats, guns and fights, kidnapping, imprisonment, interrogation and torture, memory loss, betrayal, parental death, and grief.
Teen romance remains present, but loyalty, trust, and Cammie's changing understanding of her family become more central than the original crush plot. Readers expecting six equally light school comedies may appreciate knowing about that shift before they begin.
Where to start
Where Should a New Reader Start?
Where the story begins
First Book in the Series
Sale price
$1248
Book #1 · Chapter Book · Ages 12–18 · 2006
I'd Tell You I Love You, But Then I'd Have to Kill You
By Ally Carter
A young spy faces her toughest mission yet: navigating love while keeping her true identity hidden.
304 pages· 68,097 words· Est. 6.5 hour read
$12.99Save 4%
Paperback
Summary: Cammie Morgan, a spy-in-training at the secretive Gallagher Academy, excels in espionage but is baffled by romance. Fluent in fourteen languages and skilled in covert operations, she meets a boy who believes she's just an ordinary girl. As she juggles her double life, Cammie must decide if she can maintain a relationship without revealing her true identity. With her heart on the line, Cammie embarks on her most perilous mission yet—falling in love. Can she balance the demands of her secret world with the complexities of teenage romance?
In reading order
Gallagher Girls Series
6 books · Published 2006–2013
#1
Sale price
$1248
I'd Tell You I Love You, But Then I'd Have to Kill You
Chapter Book · Ages 12–18 · 2006
A young spy faces her toughest mission yet: navigating love while keeping her true identity hidden.
#2
Sale price
$1049
Cross My Heart and Hope to Spy
Chapter Book · Ages 12–15 · 2007
A young spy must clear her name and uncover secrets as danger looms at her elite school.
#3
Sale price
$1139
Don't Judge a Girl by Her Cover
Chapter Book · Ages 12–15 · 2009
Spy students face a deadly plot while protecting a vice-presidential candidate's daughter.
#4
Sale price
$958
Only the Good Spy Young
Chapter Book · Ages 12–15 · 2010
A young spy faces betrayal and danger as she uncovers secrets that could change everything.
#5
Sale price
$958
Out of Sight, Out of Time
Chapter Book · Ages 12–15 · 2012
A spy school student races to recover lost memories while evading a relentless enemy.
#6
Sale price
$1049
United We Spy
Chapter Book · Ages 12–15 · 2013
Spies race to stop a terrorist plot that could change everything.
Good to know
Common Questions
How many books are in the Gallagher Girls series?
There are 6 books in the Gallagher Girls series. It began with I'd Tell You I Love You, But Then I'd Have to Kill You in 2006, and the newest book, United We Spy, was published in 2013.
What order should you read the Gallagher Girls books in?
Start with I'd Tell You I Love You, But Then I'd Have to Kill You and follow the series order — the books above are numbered #1 through #6.
What ages are the Gallagher Girls books best for?
The series is best for ages 12–18, based on the age ranges of the individual books.
Which Gallagher Girls book is the longest?
United We Spy (Book #6) is the longest book in the series at 68,843 words (320 pages).
Which Gallagher Girls book is the shortest?
Only the Good Spy Young (Book #4) is the shortest at 56,153 words (288 pages).
The people
The Creative Behind the Books
The people who bring Gallagher Girls to life.
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