One stormy night, young couple Zakes and Beth are driving through the darkness up the M1 when they are abruptly cut up by a wildly-driven truck. For a split second, the back of the vehicle rolls open to reveal what looks like a half naked woman tied up and caged. Shaken up and confused, Zakes chooses not to help but to drive away. Later that night his decision returns to haunt him in the worst possible way as to his horror he is dragged into the brutal and dangerous game of cat-and-mouse on the relentless, rain-soaked motorway.