A couple and their infant move into the backwoods. The husband, an expert in microbiology, has come to inspect the trees for clearance. He is warned by the locals not to trespass the forests as the "hallows" will trespass into his house and steal his baby. One night the window of the infant's room is broken, but the local cop assures the couple not to worry, some bird must have done it. But things get dreadful as the mystery unfolds.