At once, the young sleuth is confronted with the mystery of a hijacked plane and a missing pilot. Then the rancher's prize pony, Major is stolen. Nancy becomes a detective in a plane and on horseback to track down the elusive sky phantom and the horse thief.
The young sleuth faces two separate mysteries: a hijacked plane and a missing pilot, alongside the theft of a prized pony. Nancy becomes a detective in both an airplane and on horseback to solve these cases.