Grant returns home from the military to the decaying farmhouse where he was brought up. He has come looking for answers into the death of his estranged father. Once there he finds the familiar countryside different - sinister. A strange woman is hiding, terrified, in his deserted, isolated home. As the sun goes down it becomes clear they are not alone: a siege by a horde of brainwashed Christian cultists ensues and the besieged are forced to unite against the common enemy. Will they survive the night?