The Wildheart Conspiracy — Joseph C. Fackrell

Dr. Dennis had taken his new bride and moved across the country rather than approve the defective drug his employers were pushing, but they carried a terrible secret with them. In their efforts to escape the mercenaries sent after them, they fought from a small aircraft and were forced to flee down the ice-covered Green River and through the Cataract Canyon of the Colorado. They eventually had to face their pursuers with no one knowing their need for help.