Merciful

Claire is a seventeen year old girl, who's been bullied her entire life, and is on the brink of suicide. The night she plans to do it. A crazed serial killer, Sebastian, breaks into her home and murders her adoptive parents without her knowing. When its her turn to see the end of his blade he for some reason cannot kill her. Therefore, he abducts her and takes her in , to Claire's surprise, not as a hostage but a guest.