An American village is visited by some unknown life form which leaves the women of the village pregnant. Nine months later, the babies are born, and they all look normal, but it doesn't take the "parents" long to realize that the kids are not human or humane.
Loving but irresponsible dad Daniel Hillard, estranged from his exasperated spouse, is crushed by a court order allowing only weekly visits with his kids. When Daniel learns his ex needs a housekeeper, he gets the job -- disguised as an English nanny. Soon he becomes not only his children's best pal but the kind of parent he should have been from the start.
When neighborhood kids begin vanishing, Jenny suspects her child psychologist husband, Carter, may be resuming the deranged experiments his father performed on Carter when he was young. Now, it falls to Jenny to unravel the mystery. And as more children disappear, she fears for her own child's safety.