Two ranchers are found murdered on a ranch in a remote area in Southern Arizona. Their bodies are discovered by Jake French, a low-key cowboy who works on one of the ranches. The array of ranch owners, employees and local characters, in addition to Jake's mysterious background, complicate the job for Sheriff Wayne Rogers to solve this double murder. Murder at the Joshua Tree is a complicated search for answers that throws law enforcement into a long pursuit to catch the people responsible for the murders, and ultimately decipher the mystery.