Kim Marsden inherits a cattle station near Alice Springs after the death of her father. Kim becomes convinced her father was murdered. She sends for a legendary local bushman called the Sundowner, who was one of her father's best friends.

Helped by socialite Janice Kendon and barkeeper Scott O'Brien, Arizona deputy sheriff Les Martin works to solve three brutal murders in and around the Grand Canyon. His efforts leads to the killer fleeing with Janice as a hostage and a chase by car and helicopter lead to a climax on a miner's bucket on cables a mile above the canyon floor.

The men from U.N.C.L.E. must stop the assassination of an African head of state with the help of a simple housewife.