Science & Strange


by MarcyKate Connolly & Kathryn Holmes

Feiwel and Friends
Release Date: 1.30.2024
Hardcover, paperback, ebook
Middle Grade Mystery

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.

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NEW! e-Visit with the Authors!

I’m now offering e-Visits, a completely virtual school or library author visit experience! THE THIRTEENTH CIRCLE e-Visit subscription provides a a year’s worth of access to videos discussing our book, along with read alouds, tie-in activities, and resources. The content is a collection of independent segments designed to be flexible so you can use it in the way that best suits you and your classroom or group.

Discussion Guide

Praise for The Thirteenth Circle

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


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

“Come for the crop circles, but stay for the friendship―this fantastic collaboration is unstoppably exciting. It absolutely sparkles with two of the most authentic, lovable narrators I’ve read in a long time. Crackling with wit, smarts, spunk, and surprises, this is 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

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


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

The Thirteenth Circle weaves real science into a compelling mystery full of friendship, adventure, and intrigue. I love how passionate and courageous Cat and Dani are in their quest to uncover the truth.”

Janae Marks

Author of From the Desk of Zoe Washington and On Air With Zoe Washington

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