The plot concerns the unseen driver of a primer gray Dodge Charger, (consisting of mixed year's makes 1971, 1974) kidnapping, molesting, and sometimes murdering young girls around the fictional locale of Copper Valley, Arizona and a bus driver who chases the car, after it kidnaps her daughter played by Marcie Leeds.

As the driver of the car continuously stalks Laura, it soon abducts Stephanie's friend Kim who is later found dead, floating in a nearby lake.

Laura visits the police station and talks with Detective Drummond (Snyder), who says that in spite of all of the searches, nobody claims to have seen the car or its driver.

The following day, Stephanie is waiting on her mother to pick her up from gymnastics practice, but Laura is delayed by a passing freight train.

After a long hunt, the car appears and tries to run Laura down when she gets out of the bus, but she manages to climb aboard and continue the chase.

Laura and Stephanie are tearfully reunited, however, just when it seems that the whole ordeal is ending, the car unexpectedly reappears, with its roof visibly caved-in, and accelerates straight towards the bus.

Laura manages to restart the bus and reverse out of the path of the speeding Charger, causing the car to fly off of a cliff and drop down into the quarry.