After receiving a mysterious African mask in the mail, Ellen Morris is attacked by a "being" she refers to as The Nightmare Man. Her doctors and husband, William, believe Ellen is a paranoid schizophrenic and needs to spend some quality time at a mental facility for further examination. On the way to the hospital, their car runs out of gas. William walks into the nearest gas station as Ellen waits in the car while the sun sets. Alone once again, Ellen is attacked by the mysterious Nightmare Man and runs off into the nearby woods, but is this man/demon real or is it all in Ellen's mind?