Back of Beyond (1995)

Following the death of his sister Susan, garage owner Tom McGregor becomes a recluse in his Outback home. Years later, Tom is disturbed by the arrival of a gang of thugs trying to stash some stolen diamonds, whose car had broken down. The thugs are led by Connor, a psychopath, and things begin to turn nasty when Connor's girlfriend Charlie begins to become attracted to Tom. But things are not what they seem...