Dark Country

Dark Country is a 2009 psychological crime thriller directed by and starring Thomas Jane in his directorial debut. It also stars Lauren German and Ron Perlman.

During the drive, the couple argue and the injured man awakens with a scream. He asks Gina for a cigarette, advises her to leave her husband and becomes increasingly erratic, finally attempting to strangle Dick and almost causing the car to crash. Gina stops the car and the two men tumble out, continuing to fight until Dick beats the stranger to death with a rock. Dick convinces his wife they need to dispose of the body, and together they bury it in a shallow grave. While she fills the hole, Dick finds a revolver in her handbag. Soon after, they arrive at a rest area where several cars are parked. They tidy themselves up and argue until Dick discovers he lost his watch while they were burying the stranger. Refusing to go back, Gina waits at the rest stop with the gun while Dick returns to find his watch. Arriving at the site where they hid the body, Dick finds the grave empty. Gunshots ring out across the desert and Dick races back to the rest stop to find Gina is missing. Nearby, he stumbles onto a womans grave and realizes that the other cars are rusted and covered with dust.In a panic, he flees, almost colliding headon with a deputy sheriff Ron Perlman. In the back of the police car, he rides with the deputy to a crime scene, where police are excavating murder victims from a mass grave surrounded by abandoned vehicles. The deputy explains that this was where the rest area had beenyears before. Dick recognizes the spot as the location where he buried the stranger. As he watches on from the back of the police car, a deputy exhumes Ginas body and finds Dicks watch. Dick kicks his way out of the patrol car and escapes in one of the nearby vehicles, leading the squad of police in a chase across the desert. ........

Source: Wikipedia