Book excerpt: When Mimi, Papa, Christina and Grant visit a U.S. Park Ranger friend and her two children, the kids almost immediately embark on a GRAND adventure! Join them on an exciting tour--by helicopter, stubborn mule and tipsy-turvy whitewater raft--down the Colorado River through the Grand Canyon! Each 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 also has an Accelerated Reader quiz, a Lexile Level, and a Fountas & Pinnell guided reading level.