*** NEW free study guide written by the author: www.kristianagregory.com ***During spring break, college student Ariel (from #3, "The Legend of Skull Cliff"), takes the cousins and family friend Mr. Wellback, camping as her assistants. She has grant money to study wildlife with a drone. But when someone breaks into their tents and steals Claire's diary and David's sketchbook, the cousins feel they're being watched. And when a different drone hovers while they're fishing, the kids set out to investigate who is spying on them, and why?
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