This document analyzes the opening scene of the film "Gone Girl" to identify elements that establish it as a thriller genre. Several clues are presented that set the tense, mysterious tone through unsettling music, dim lighting, quick camera cuts, and a narrative that hints at danger without fully explaining the situation. Flashbacks, doors opening without explanation, and signs of a struggle are identified as conventions used to build suspense and leave the audience wondering what happened. The analysis concludes the opening sequence successfully leaves clues without revealing the full plot to engage audiences in a thriller.