In 1957, 11 year-old Joanna and 6 year-old Jacqueline Pollock were killed in a car accident. A year later, their mother gave birth to twins Jennifer and Gillian. The younger twin, Jennifer, had birth marks on her body in exactly the same place as Jacqueline had. The twins then started requesting toys belonging to the deceased girls which they had no prior knowledge of. The twins even asked to go to a park they have never been to before (but their deceased sisters have).