Former priest Graham Hess (Mel Gibson) lives with his children, Morgan (Rory Culkin) and Bo (Abigail Breslin) on a quiet farm in rural Pennsylvania. Graham's younger brother, Merrill (Joaquin Phoenix), also lives with them.
Graham discovers a curious crop circles in his field, and feels the farm is being watched. More crop circles appear around the world. Soon after that a string of bizarre incidents begin to occur on the farm. The family starts to investigate and what they eventually discover will forever alter their lives.