Graham Hess and his young son and daughter, Morgan and Bo, struggle to recover from the tragic death of Graham’s wife. A neighbor struck and killed her with his car when he fell asleep at the wheel. Graham’s younger brother, Merrill, has been staying with the family. Devastated and bitter, Graham, a reverend, believes God betrayed him, and he has abandoned his ministry.
Mysterious crop circles appear on the Hess' farm and soon the world over. Alien scouts are spotted, and before long, ships arrive from outer space. With TV and radio their only link to the outside world, the isolated Hess family watch in horror as the alien threat turns into a deadly close encounter. The hostile beings are galactic raiders who harvest planetary life forms. With invasion imminent, the family barricade themselves inside the house. As the aliens are breaking in, they retreat to the cellar.