A married couple with two young girls decide to split up. Well, sort of: they will stay in their house, but take turns living with the girls. One week they have the girls and live upstairs, one week they live in the basement.

二十年前，一整车学生在她眼前消失；二十年后，她遇到的男子竟是当年的遇难者之一。雅丝翠的调查之路由此开启。