The Thirteenth Circle

out now in hardcover, paperback, ebook, and audiobook!

“The X-Files” meets “Scooby-Doo” in The Thirteenth Circle, a middle-grade mystery from MarcyKate Connolly and Kathryn Holmes, featuring two unexpected friends, crop circles, science fairs, and Men in Black, perfect for both the highly scientific and cryptid enthusiasts alike.

Cat knows aliens are real, and she’s determined to prove it. By studying the Weston Farm Circles, her town’s legendary crop circle phenomenon, she’ll not only demonstrate the existence of extraterrestrial life, but also win the grand prize in the McMurray Youth Science Competition―a feat she’s sure will impress her distant NASA scientist father.

Dani most certainly does not believe in aliens. How can she, when they go against every scientific principle she’s been taught? So when Dani is paired with Cat to enter the McMurray Youth Science Competition―which she has to win to avoid going to her parents’ artsy summer camp―she knows she’s at a disadvantage. Her solution? Disprove Cat’s theory, of course . . . without telling her partner her true intentions.

But as the girls bond over science, it becomes clear that there is something strange about the Weston Farm Circles. And when Dani and Cat’s project is threatened by suspicious forces, they’ll have to work together to expose the truth, once and for all.

Learn more about the book and ORDER here:

macmillan children’s

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praise for the thirteenth circle

“An entertaining, science-focused mystery that encourages readers to embrace their true selves.”
~Kirkus Reviews

“Connolly and Holmes write an absorbing story using factual science and emotional situations that will resonate with middle-grade readers.”
~Booklist

“Weaves real science into a compelling mystery full of friendship, adventure, and intrigue. An enjoyable read!”
~Janae Marks, author of From the Desk of Zoe Washington and On Air With Zoe Washington

“Crackling with wit, smarts, spunk, and surprises—a must-read for science-lovers, alien-believers,
and anyone who wants to get lost in a satisfying story.”
~Corey Ann Haydu, author of The Widely Unknown Myth of Apple and Dorothy and One Jar of Magic

“Extracurricular meets extraterrestrial. A clever exploration of the supernatural and the scientific method.
The Thirteenth Circle is out of this world!”
~Lee Bacon, author of Imaginary and The Last Human

“Remarkably clever at every twist and turn, The Thirteenth Circle will delight readers who love all things scientific and strange.”
~Juliana Brandt, author of A Wilder Magic