This document provides analysis of trailers and posters for the films The Girl with the Dragon Tattoo (2011) and Gone Girl (2014) to inform the creation of a teaser trailer. Key elements analyzed include the use of montage editing, low key lighting, repetition, mystery, and suspenseful music and dialogue. Specific shots are examined for their composition, lighting, and how they reveal or conceal information to intrigue audiences. Ideas are discussed for incorporating similar techniques that build mystery and leave audiences questioning in the group's teaser trailer project.