Spies and Thieves Chronological Order

I'd Tell You I Love You, but Then I'd Have to Kill You (Gallagher Girls #1)
Cross My Heart and Hope to Spy (Gallagher Girls #2)
Don't Judge a Girl by Her Cover (Gallagher Girls #3)
Only the Good Spy Young (Gallagher Girls #4)
Classified Files (Gallagher Girls #4.5)
Out of Sight, Out of Time (Gallagher Girls #5)
Heist Society (Heist Society #1)
Uncommon Criminals (Heist Society #2)
Double Crossed (Gallagher Girls #5.5; Heist Society #2.5)
United We Spy (Gallagher Girls #6)
A Gallagher Wedding (Gallagher Girls #6.5)
Perfect Scoundrels (Heist Society #3)
The Gift of the Magi (Heist Society #3.5)

Spies and Thieves Recommended Reading Order

I'd Tell You I Love You, but Then I'd Have to Kill You (Gallagher Girls #1)
Cross My Heart and Hope to Spy (Gallagher Girls #2)
Don't Judge a Girl by Her Cover (Gallagher Girls #3)
Only the Good Spy Young (Gallagher Girls #4)
Out of Sight, Out of Time (Gallagher Girls #5)
United We Spy (Gallagher Girls #6)
Classified Files (Gallagher Girls #4.5)
A Gallagher Wedding (Gallagher Girls #6.5)
Heist Society (Heist Society #1)
Uncommon Criminals (Heist Society #2)
Perfect Scoundrels (Heist Society #3)
Double Crossed (Gallagher Girls #5.5; Heist Society #2.5)
The Gift of the Magi (Heist Society #3.5)

The Gift of the Magi (Heist Society #3.5)

Author: Ally Carter
Publisher: NLA Digital LLC
Publication Date: November 2016
Genre: Young Adult Suspense
Summary: Katarina Bishop is a thief. To many it wouldn’t matter that she now uses her considerable skills to re-steal valuable works of art and return them to their rightful homes. She’s still a thief. So that’s why Kat’s surprised when an Interpol agent comes to her one snowy evening, asking for Kat’s help. The Magi Miracle Network was set to auction off a very rare, very valuable Faberge egg two days before Christmas, but the egg’s been stolen and now the charity’s reputation--and their future--is on the line. Kat’s family and Interpol might be opposite sides of most jobs, but someone just stole Christmas. Now it’s up to Kat and her crew to steal it back.
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Perfect Scoundrels (Heist Society #3)

Author: Ally Carter
Publisher: Disney-Hyperion
Publication Date: February 2013
Genre: Young Adult Suspense
Summary: Katarina Bishop and W. W. Hale the Fifth were born to lead completely different lives: Kat comes from a long, proud line of lovable criminal masterminds, while Hale is the scion of one of the most seemingly perfect dynasties in the world. If their families have one thing in common, it's that they both know how to stay under the radar while getting--or stealing--whatever they want. No matter the risk, the Bishops can always be counted on; but in Hale's family, all bets are off when money is on the line. When Hale unexpectedly inherits his grandmother's billion-dollar corporation, he quickly learns that there's no place for Kat and their old heists in his new role. But Kat won't let him go that easily, especially after she gets tipped off that his grandmother's will might have been altered in an elaborate con to steal the company's fortune. So instead of being the heir--this time, Hale might be the mark. Forced to keep a level head as she and her crew fight for one of their own, Kat comes up with an ambitious and far-reaching plan that only the Bishop family would dare attempt. To pull it off, Kat is prepared to do the impossible--but first, she has to decide if she's willing to save her boyfriend's company if it means losing the boy.
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Double Crossed (Gallagher Girls #5.5; Heist Society #2.5)

Author: Ally Carter
Publisher: Disney Hyperion
Publication Date: January 2013
Genre: Young Adult Suspense
Summary: Macey McHenry--Glamorous society girl or spy-in-training? W.W. Hale V--Heir to an American dynasty or master thief? There are two sides to every coin. Whether these two can work together is a tossup. Born into privilege, Macey and Hale are experts at mingling with the upper class. But even if they’ve never raised an eyebrow at the glitz, neither teenager has ever felt at home with the glamour. When Macey and Hale meet at a society gala, the party takes a dangerous turn. Suddenly they’re at the center of a hostage situation, and it’s up to them to stop the thugs from becoming hostile. Will Macey’s spy skills and Hale’s con-man ways be enough to outsmart a ruthless gang? Or will they have to seek out the ultimate inside girl to help?
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Uncommon Criminals (Heist Society #2)

Author: Ally Carter
Publisher: Hyperion Book CH
Publication Date: June 2011
Genre: Young Adult Suspense
Summary: Katarina Bishop has worn a lot of labels in her short life: Friend. Niece. Daughter. Thief. But for the last two months she's simply been known as the girl who ran the crew that robbed the greatest museum in the world. That's why Kat isn't surprised when she's asked to steal the infamous Cleopatra Emerald so it can be returned to its rightful owners. There are only three problems. First, the gem hasn't been seen in public in thirty years. Second, since the fall of the Egyptian empire and the suicide of Cleopatra, no one who holds the emerald keeps it for long -- and in Kat's world, history almost always repeats itself. But it's the third problem that makes Kat's crew the most nervous, and that is...the emerald is cursed. Kat might be in way over her head, but she's not going down without a fight. After all, she has her best friend--the gorgeous Hale--and the rest of her crew with her as they chase the Cleopatra around the globe, dodging curses and realizing that the same tricks and cons her family has used for centuries are useless this time. Which means, this time, Katarina Bishop is making up her own rules.
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Heist Society (Heist Society #1)

Author: Ally Carter
Publisher: Hyperion Book CH
Publication Date: February 2010
Genre: Young Adult Suspense
Summary: When Katarina Bishop was three, her parents took her to the Louvre...to case it. For her seventh birthday, Katarina and her Uncle Eddie traveled to Austria...to steal the crown jewels. When Kat turned fifteen, she planned a con of her own--scamming her way into the best boarding school in the country, determined to leave the family business behind. Unfortunately, leaving "the life" for a normal life proves harder than she'd expected. Soon, Kat's friend and former co-conspirator, Hale, appears out of nowhere to bring her back into the world she tried so hard to escape. But he has good reason: a powerful mobster's art collection has been stolen, and he wants it returned. Only a master thief could have pulled this job, and Kat’s father isn’t just on the suspect list, he is the list. Caught between Interpol and a far more deadly enemy, Kat’s dad needs her help. For Kat there is only one solution: track down the paintings and steal them back. So what if it’s a spectacularly impossible job? She’s got two weeks, a teenage crew, and hopefully just enough talent to pull off the biggest heist in her family’s (very crooked) history--and, with any luck, steal her life back along the way.
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A Gallagher Wedding (Ghallagher Girls #6.5)

Author: Ally Carter
Publisher: Disney-Hyperion
Publication Date: September 2013
Genre: Young Adult Suspense
Summary: The story of what happened at Cammie's mother's wedding.
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United We Spy (Gallagher Girls #6)

Author: Ally Carter
Publisher: Disney-Hyperion
Publication Date: September 2013
Genre: Young Adult Suspense
Summary: Cammie Morgan has lost her father and her memory, but in the heart-pounding conclusion to the best-selling Gallagher Girls series, she finds her greatest mission yet. Cammie and her friends finally know why the terrorist organization called the Circle of Cavan has been hunting her. Now the spy girls and Zach must track down the Circle's elite members to stop them before they implement a master plan that will change Cammie--and her country--forever.
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Out of Sight, Out of Time (Gallagher Girls #5)

Author: Ally Carter
Publisher: Hyperion Book CH
Publication Date: March 2012
Genre: Young Adult Suspense
Summary: The last thing Cammie Morgan remembers is leaving the Gallagher Academy to protect her friends and family from the Circle of Cavan--an ancient terrorist organization that has been hunting her for over a year. But when Cammie wakes up in an Alpine convent and discovers that months have passed, she must face the fact that her memory is now a black hole. The only traces left of Cammie's summer vacation are the bruises on her body and dirt under her nails, and all she wants is to go home. Once she returns to school, however, Cammie realizes that the Gallagher Academy now holds more questions than answers. Cammie, her friends, and mysterious spy-guy Zach must face their most difficult challenge yet as they travel to the other side of the world, hoping to piece together the clues that Cammie left behind. It's a race against time. The Circle is hot on their trail and will stop at nothing to prevent Cammie from remembering what she did last summer.
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Classified Files (Ghallagher Girls #4.5)

Author: Ally Carter
Publisher: Ghallagher Girls Wikia
Publication Date: March 2012
Genre: Young Adult Suspense
Summary: Only Ally knows the secrets that lie within the world of the Gallagher Girls. And the biggest secret of all? In Out of Sight, Out of Time, the fifth installment in the Gallagher Girls series, Cammie “The Chameleon” Morgan has awoken in an alpine convent with one very important thing missing--her memory. So what happened to Cammie over the summer? Did her friends manage to find her before it was too late?
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Only the Good Spy Young (Gallagher Girls #4)

Author: Ally Carter
Publisher: Hyperion Book CH
Publication Date: June 2010
Genre: Young Adult Suspense
Summary: When Cammie Morgan enrolled at the Gallagher Academy for Exceptional Young Women, she knew she was preparing for the dangerous life of a spy. She just didn't know that life would start during her junior year of high school. But that's exactly what happened two months ago when Cammie faced off against a mysterious organization called the Circle of Cavan. Now, even Cammie The Chameleon can't hide. Danger has followed her to London where she discovers a trusted ally has been labeled a rogue operative. The Gallagher Girls quickly realize that the Circle's agents are closer than they'd ever feared--maybe even within Gallagher Academy's own walls. History of Espionage takes on an entirely new meaning as Cammie and her friends go looking for answers, recognizing that the key to Cammie's future may lie deep in the past.
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Don't Judge a Girl by Her Cover (Gallagher Girls #3)

Author: Ally Carter
Publisher: Hyperion Books
Publication Date: June 2009
Genre: Young Adult Suspense
Summary: When Cammie Morgan visits her roommate Macey in Boston, she thinks she's in for an exciting end to her summer. After all, she's there to watch Macey's father accept the nomination for vice president of the United States. But when you go to the world's best school (for spies), "exciting" and "deadly" are never far apart. The girls suddenly find themselves trapped in a kidnappers' plot, with only their espionage skills to save them. Soon Cammie is joining Bex and Liz as Macey's private security team on the campaign trail, where they struggle to answer the questions: Who is after Macey? And how can the Gallagher Girls keep her safe? The girls must use their spy training at every turn as the stakes are raised, and Cammie gets closer and closer to the shocking truth....
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Cross My Heart and Hope to Spy (Gallagher Girls #2)

Author: Ally Carter
Publisher: Hyperion Book CH
Publication Date: October 2007
Genre: Young Adult Suspense
Summary: After staking out, obtaining, and then being forced to give up her first boyfriend, Josh, all Cammie Morgan wants is a peaceful semester. But that's easier said than done when you're a CIA legacy and go to the Gallagher Academy, the premier school in the world...for spies. Despite Cammie's best intentions to be a normal student, danger seems to follow her. She and her friends learn that their school is going to play host to some mysterious guests-- ode name: Blackthorne. Then she's blamed for a security breach that leaves the school's top secret status at risk. Soon Cammie and her friends are crawling through walls and surveilling the school to learn the truth about Blackthorne and clear Cammie's name. Even though they have confidence in their spy skills, this time the targets are tougher (and hotter), and the stakes for Cammie's heart--and her beloved school--are higher than ever.
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I'd Tell You I Love You, But Then I'd Have to Kill You (Gallagher Girls #1)

Author: Ally Carter
Publisher: Hyperion Book CH
Publication Date: April 2006
Genre: Young Adult Suspense
Summary: Cammie Morgan is a student at the Gallagher Academy for Exceptional Young Women, a fairly typical all-girls school--typical, that is, if every school taught advanced martial arts in PE and the latest in chemical warfare in science, and students received extra credit for breaking CIA codes in computer class. The Gallagher Academy might claim to be a school for geniuses, but it's really a school for spies. Even though Cammie is fluent in fourteen languages and capable of killing a man seven different ways with her bare hands, she has no idea what to do when she meets an ordinary boy who thinks she's an ordinary girl. Sure, she can tap his phone, hack into his computer, or track him through town with the skill of a real "pavement artist"--but can she maneuver a relationship with someone who can never know the truth about her?
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