Four young friends on a camping adventure in outback Australia are run off the road by a mystery road train - a massive three-trailer truck. With their own 4x4 wrecked and the road train stopped, the friends march off to remonstrate with the driver. But there is no one to be found. Suddenly, the silence is broken by the sound of gunshots. A distant figure screams and runs towards them. Are they witnesses to a murder? Theres no time to discuss it. The friends commandeer the road train. The next town is only three hours away. But the next town is somewhere they will never reach. What they discover inside the vehicles trailers proves more terrifying than anything out there on that lonely road.