Edge of Eternity plot
"Mile-High Suspense In The Grand Canyon!"
A well-dressed elderly man drives a wagon along the winding mountain road adjacent to the Grand Canyon. Another man is waiting for him where the road ends. They fight and then the car and one of the men disappear into a mile-deep chasm. Thus begins a series of four murders that must be solved by newly recruited Mojave County Deputy Sheriff Les Martin and his superior, Sheriff Edwards. Les, who worked in the homicide department in his previous job and gained a lot of expertise there, took the job as a deputy sheriff due to personal problems. He hopes to solve the murders in order to get his old job back. During the investigation, Les and Edwards learn that the very attractive and wealthy Janice Kendon is involved in all four murders.