In rural Pennsylvania, the quiet existence of a former Episcopal priest, Graham Hess, is disrupted when mysterious crop circles appear in his cornfields. Struggling with a crisis of faith after the death of his wife, Graham lives with his two children, asthmatic son Morgan and daughter Bo, who has a peculiar habit of leaving half-drunk glasses of water around the house. His younger brother Merrill, a failed minor-league baseball player, has moved in to help out. The strange formations in their crops initially seem like an elaborate hoax, but reports of similar occurrences around the world, along with other unexplained phenomena, suggest that something more ominous may be at play.

As local law enforcement and the media descend on their farm, the family begins to witness increasingly bizarre and frightening events. Animals behave erratically, electronic equipment fails, and an unsettling presence seems to lurk in their fields at night. Coping with the growing tension and his own internal struggles, the patriarch tries to maintain a semblance of normalcy for his children while grappling with the possibility that the phenomena could be related to extraterrestrial activity. Isolation and fear take hold as the family strives to understand the purpose behind the patterns and the increasingly hostile intrusions into their home, forcing them to confront their doubts and fears.