Christina, Grant, Mimi and Papa snowmobile into Yellowstone National Park to encounter mud pots, geysers, bison, beauty, bears, volcanic action, and a mystery of historic proportions! LOOK what's in this mystery - people, places, history, and more! This mystery incorporates history, geography, culture and cliffhanger chapters that keep kids begging for more! Each mystery includes SAT words, educational facts, fun and humor, Built-In Book Club and activities. Each Carole Marsh Mystery will have an Accelerated Reader quiz, a Lexile Level, and a Fountas & Pinnell guided reading level.