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!The Mystery Underground is part of the Powerful Mathematicians who Changed the World book series. Edited by Christa Jackson and illustrated by Estrella Bascuñan, the Powerful Mathematicians who Changed the World book series centers on underrepresented mathematicians we do not typically hear or learn about in school. By reading the stories, you and your child will gain insight into the remarkable work of these mathematicians, learn about their mathematical contributions, and become more intrigued and see yourself more as learners and doers of mathematics. You and your child will see how mathematics helps us understand the world in which we live through these captivating stories. You will witness your own mathematical brilliance.