Nancy must go to colorful Cheyenne, Wyoming, to solve her latest mystery involving the missing daughter of aging millionaire Arlo Winthrop.
On the plane, Nancy and friend Ned meet Jennifer Buckman, a lonely ten-year-old. When the plane lands in Cheyenne, the young detective faces another problem--no one has come to meet Jennifer at the airport!
Against the panorama and excitement of rodeos, parades, and a festive carnival, Nancy faces grave danger. Nearly fatal accidents involving an antique stagecoach and a bucking bull could prevent her from ever finding the long-awaited answers to the intriguing mysteries!