Two teenagers struggle with a horrific family legacy, and the woman who has adopted them fights for their lives, and her own. Adam and Alice are reaching the age when some of the children created by the fertility treatment that spawned them begin to turn feral. Will they succumb to the same physiological horror that destroyed their parents? Meanwhile, in the world outside, the forces of good and evil collide as a troop of feral offspring threatens to invade the teenagers' refuge.