After losing their parents in a car accident, orphaned brothers Kevin and Bobby Dalton are taken in by their God-fearing, hard-working grandparents, who raise them for a life on the farm. While operating a combine harvester in the cornfield, Kevin stirs up a small swarm of locusts, and in an abnormal act of aggression, the large insects attack him like angry bees. One of them latches onto his neck and bites him, but Kevin soon discovers it wasn't a bite at all. For the Dalton family, the destructive pests in the cornfield are the least of their concerns, because something far more menacing is about to infiltrate their home."...the locust will consume..."