1) Damien Ridgeway is released from prison and begins stalking his daughter Lucy, leaving a music box that plays a lullaby at her house.
2) Lucy is terrified by Ridgeway's presence and the music box, which only she can hear.
3) When a police officer comes to investigate, Ridgeway kills him. Ridgeway is now inside Lucy's house as she pleads for help in a video diary, and the music box plays its lullaby.