The trailer uses common horror film conventions to set up the plot and introduce the protagonist and antagonist. It begins with an establishing shot of a house at night that creates feelings of isolation and discomfort. The protagonist, a babysitter, is introduced as she watches over two children. Supernatural elements are hinted at through quick cuts showing an evil-looking boy. As the trailer progresses, the boy gets closer and more aggressive towards the protagonist. She is portrayed as a strong character fighting against the spirit of her unborn twin brother who is antagonizing her. Editing, sound, and camera shots are used to build tension and scare the audience.