Gypsy Flight - Roy J. Snell

Rosemary Sample, an airplane stewardess, meets a mysterious dark lady on a flight to Salt Lake City. The plane is forced down overnight by a snowstorm. The passengers spend the night in a Hunting Lodge. In the morning, the dark lady finds her bag missing. It contains important papers that may mean the life or death of thousands of people in the small town of Happy Vale. - Summary by Dawn Larsen