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! 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 has an Accelerated Reader quiz, a Lexile Measures, a Fountas & Pinnell guided reading level and a Developmental Reading Assessment.