The trailer establishes genre conventions through its use of unsettling elements. It begins with poorly played piano music and dark lighting to create an ominous atmosphere. Daniel Craig's voiceover uses the phrase "once upon a time" in a twisted way to subvert childhood comfort. Key selling points are the star power of Daniel Craig and the psychological/supernatural elements that create suspense. The trailer effectively establishes mood through its ominous tone and unsettling images of children in potential danger. It uses generic horror codes like dark lighting and sudden jarring sounds. The trailer meets expectations by hinting at murders and challenging concepts of home and family safety.