Casey Beldon has become plagued by merciless dreams, visions of strange looking dogs, and an evil child with bright blue eyes. After being hit with a mirror by her neighbor's son, Casey's eyes begin to change color and she learns she had a twin brother who died in the womb. Casey begins to suspect that the spirit haunting her is the soul of her dead twin who became possessed by a malevolent spirit known as dybbuk. The spirit wants to be born so it can transfer to the world of the living. Casey meets a woman named Sofi who explains that as a child, she had a twin brother who was killed in Nazi experiments and he was brought back to life by a dybbuk who intended to use his body as a portal into the world of the living. Sofi killed the dybbuk and now it haunts her family for revenge. Sofi refers Casey to Rabbi Sendak who can perform a Jewish exorcism to remove the dybbuk. The exorcism is performed, but things go awry as the dybbuk tries to stop the ritual from being completed. The dybbuk disappears after the exorcism and soon afterward, Casey learns she is pregnant with twins.