From the back cover: A horse ride for Crista and her friends quickly turns into excitement and danger! A circus accident has set a grizzly loose on Moonlight Mountain, and the sheriff's men have begun an all-out search to stop the bear-- no matter what it takes.
But there's something suspicious going on. Following a trail of puzzling clues, Crista discovers that the accident wasn't really an accident. Someone deliberately tried to hurt the bear! But who would want to harm a trained circus bear-- and why?