Below is the complete list of Stuart Gibbs’ Charlie Thorne books in order of publication. This is the recommended reading sequence for the series.
Charlie Thorne Books
- Charlie Thorne and the Last Equation (2019)
View Book - Charlie Thorne and the Lost City (2021)
View Book - Charlie Thorne and the Curse of Cleopatra (2022)
View Book - Charlie Thorne and the Royal Society (2024)
View Book
About Charlie Thorne
Stuart Gibbs’s Charlie Thorne books take the puzzle-and-adventure energy he is known for and push it into a more global, high-stakes direction. The series follows Charlie, an extraordinary young genius whose gifts make her valuable to intelligence agencies and dangerous to the people chasing the same secrets she is. That hook is strong on its own, but the real appeal goes deeper. Charlie is not just generically smart. She is the kind of prodigy who reads patterns instantly, solves problems under pressure, improvises when plans collapse, and stays several steps ahead of older, stronger, and better-armed opponents.
The series currently runs in publication order as Charlie Thorne and the Last Equation (2019), Charlie Thorne and the Lost City (2021), Charlie Thorne and the Curse of Cleopatra (2022), and Charlie Thorne and the Royal Society (2024). That order matters because this is not the kind of adventure series where everything resets neatly from book to book. Each mission has its own central mystery, but Charlie’s situation, alliances, and enemies carry forward. Publication order is the cleanest and most rewarding way to read them.
What makes the books stand out is the way they combine middle-grade pacing with genuinely big intellectual hooks. Each novel revolves around a historical figure, scientific idea, or lost discovery with world-changing implications. The first book ties Charlie to Einstein. The second sends her after a hidden secret connected to Darwin and South America. Later books continue that pattern, using famous names and buried knowledge not just as decorative references, but as the engine of the plot. That gives the series more weight than a standard treasure-hunt adventure. The stakes are not only physical danger, but who gets control of knowledge powerful enough to change the world.
Charlie herself is a big part of why the series works so well. She is introduced not as a polished government operative, but as a young genius with the instincts of a survivor. That combination keeps the series lively. She can think like a scientist, but she can also think like someone who has spent her life staying alert, skeptical, and hard to trap. The result is a heroine who feels a little different from some of Stuart Gibbs’s other protagonists. Ben Ripley in Spy School grows into danger. Charlie often feels as if she was born to outmaneuver it.
Another strength of the series is scale. These books move. They are not confined to one campus, one hometown, or one recurring institutional setup. The stories rely on travel, clue-chasing, hidden history, and international pressure. That gives Charlie Thorne a slightly broader and more intense feel than some other middle-grade adventure series, even though the books remain highly accessible. They read fast, but the ideas underneath them are not small.
The series also benefits from the way Gibbs balances intellect with momentum. Charlie is brilliant, but the books never become slow or lecture-heavy. The historical and scientific material is folded directly into the suspense. Clues, betrayals, chases, and coded information all work together, so the reader gets the thrill of learning something while still being carried by the story. That balance is one of Gibbs’s best strengths as a writer, and it is especially visible here.
Reading the books in publication order lets Charlie’s world sharpen naturally. The first novel establishes who she is and why powerful people want what she can find. The later books widen both the conspiracy and the emotional stakes. By the time you get to The Royal Society, the series is no longer just about one brilliant girl solving one impossible puzzle. It has become a continuing adventure line about intellect, trust, power, and the battle over who gets to control dangerous knowledge. For a series built on historical secrets and modern pursuit, that progression is a big part of the fun.