A new car salesman, tasked with delivering a custom built Mustang to an affluent client, encounters a mysterious tanker truck that relentlessly pursues him along the mountain highways of western North Carolina, engaging in a series of brutal hit-and-run murders. Taunted by the big rig, the mild-mannered salesman finds himself in a murderous game of cat-and-mouse with the homicidal truck, pitting the Mustang's 600 hp against the mechanized monstrosity.