The stakes have never been higher for Cooper Wilder. When an accident puts Cooper's dad in the hospital, Cooper must shoulder new responsibilities at the campground. But he's distracted. First, he finds a fox caught in an illegal trap on the campground's land. Then kits start to go missing from the fox den. Who would want to steal the foxes? And why? Cooper joins forces with his friends, Packrat and Roy, to solve the mystery. The three young detectives must protect the den, find the kits, and (hopefully) rule out Summer, the new girl who lives across the lake, as a suspect. Juggling new work duties, feeling guilty about his father's accident, and desperate to help the fox kits, Cooper faces tough decisions about who—and what—should come first.