It's spring, the season of flowers, sunshine . . . and bugs? Bug mania has hit River Heights Elementary! After Nancy and her classmates return from a field trip to the River Heights Insectarium, the Bug Club is the talk of the school. But the bug show-and-tell goes from creepy-crawly to just plain creepy when someone steals a Bug Club member's valuable beetle. Can Nancy and the Clue Crew find her before she's ensnared in some evil web?