Len MacAfee, a scarred veteran of 2 wars, takes a job as a paramedic for a private ambulance service located in a small mining town in northern Nevada. Hoping for a quiet and steady job, he begins to suspect that someone is targeting the little town. After 2 suspicious accidents and 1 near-miss, 2 bogus call outs to the middle of nowhere, Len is soon convinced that the incidents are more menacing than just prank calls and graffiti scrawled on the sides of the ambulance shed.