Solving secret codes, uncovering a scandal, and trying to have cleaner water in their town—they’re all part of the adventures in The Mystery Underground! When Jake and Selah find confusing messages while geocaching, they aren’t sure what the notes mean. But after reading about Agnes Meyer Driscoll, a cryptanalyst, and learning about different ciphers and codes, they work with Rory, Xavierra, and Danielle to decode the odd messages. They realize the secret codes are part of a plot by some very important people to cover up problems in their town of Pottersville. Can Jake, Selah, Rory, and Xavierra use their new knowledge to solve the codes and help Pottersville? Find out in The Mystery Underground!

About the Authors

Christa Jackson is a professor of educational studies at Saint Louis University. Her research examines mathematics and STEM education, with a focus on equity, diversity, and teacher professional learning.

Cynthia E. Taylor is a professor of mathematics at Millersville University. Her work centers on undergraduate mathematics education, teacher preparation, and equitable instructional practices.

Jessica Stagg is a mathematics educator and contributor to NCTM professional resources. Her work addresses mathematics teacher learning and instructional practice.

Jessica Stagg is a mathematics educator and contributor to NCTM professional resources. Her work addresses mathematics teacher learning and instructional practice.

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