Christina, Grant, Mimi, and Papa travel to Wyoming's Devils Tower and climb into a "towering" mystery involving Native Americans, dinosaur fossils, precocious prairie dogs, fascinating footprints, Unidentified Flying Objects, and... gulp... aliens This mystery incorporates history, geography, culture and cliffhanger chapters that keep kids begging for more! This mystery includes SAT words, educational facts, fun and humor, scavenger hunt and activities. This Carole Marsh Mystery has Accelerated Reader Reading Levels, Lexile Measures, Fountas & Pinnell Guided Reading Levels and Developmental Reading Assessments Level.