Self-proclaimed goofballs Jeff, Brian, Mara, and Kelly investigate the disappearance of rich Randall Crandall's horse, Thunder. Interest Level: K-3 Reading Level: 3.0 ATOS Book Level: 3.3 AR Interest Level: LG AR Points: 1 AR Quiz: 149914EN Reading Counts Level: 2.6 Reading Counts Points: 4 Lexile Measure: 490 Fountas & Pinnell: M.