When Avery, Ella, and Evan visit Yellowstone National Park, they just assume grizzlies are big bad bears. However, after a trip to a center that rescues orphaned grizzly cubs, where they learn how humans don't always play fair with wildlife, they begin to see a different side of the story. Mystery ensues, and the kids use high-tech STEM skills and high-tech gear to try to discover who or what is breaking into cabins across the region. Can they help without getting entangled in terrifying bear teeth? Before they know it, the kids are mixed up in an adventurous mystery where clues require them to use their best science, technology, engineering and math skills to find the answers Mystery books have always been a great higher-order, critical thinking genre, and the "real Kid characters" in this series eagerly get into using high-demand Science, Technology, Engineering, and Math (STEM) skills to solve each mystery