The Unborn

Casey Beldon (Odette Yustman) is plagued by nightmare visions of strange looking dogs, and an evil child with bright blue eyes.

While baby-sitting Matty, her neighbor's son attacks her with a mirror. After being hit with the mirror, Casey's eyes begin to change color, an optician explains that she is experiencing Tetragametic chimerism and Heterochromia. After questioning her father 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, being possessed by a dybbuk, wanting to be born so it can transfer to the world of the living.