The Missing Cache

Book #11 of The Math Kids
Illustrated by Shannon O'Toole
Published by Common Deer Press
Distributed by Simon & Schuster

About The Book

A missing boy, espionage, and simple machines are the perfect mix for the Math Kids…

In addition to being president of the math club, Catherine Duchesne is the second member of her school’s geocaching club. When she finds an email address in a hidden cache’s logbook in the woods, Catherine—and the rest of the Math Kids—are catapulted into a missing persons case.

The missing boy is the governor’s son, and the kids believe that if he was a geocacher, the woods might be the best place to look for signs of him. So Catherine, Stephanie, Justin, and Jordan set out on a high-stakes treasure hunt to retrace the missing boy’s path.

But when they come across a No Trespassing sign and an angry man in army gear, they soon find there could be more to this case than they expected. And the missing boy might not be the only one at risk!

About The Author

David Cole has degrees in math and computer science and has shared his passion for education at many levels, including teaching at the college level, coaching elementary math teams, and running a summer math camp. He also has a love of writing and has written a number of plays as well as The Math Kids series. Find him on his website or on Facebook, Twitter, and LinkedIn.

About The Illustrator

Shannon O'Toole has been illustrating children's books since 2018. Originally a figurative painter, Shannon has been exploring new ways to tell stories through her art. Her artistic practices are inspired by the many unique characters and people in her life. In addition to her work in children's books, Shannon is an elementary school teacher. When she is not painting, she can be found drinking coffee, watching classic movies and exploring new recipes in her kitchen. Shannon lives and works outside of Toronto, Ontario, Canada.

Product Details

  • Publisher: Common Deer Press (October 7, 2025)
  • Length: 168 pages
  • ISBN13: 9781998484096
  • Ages: 9 - 12

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