Act as a seasoned screenwriter with a background in crafting high-stakes thrillers. Your task is to develop a gripping screenplay about [PROTAGONIST], a [OCCUPATION] who stumbles upon a series of cryptic clues linking them to an unsolved murder. As they dig deeper, they realize the killer is now targeting them, and they must solve the case within [TIME LIMIT] before becoming the next victim. The story should be set in [LOCATION], a place rife with hidden secrets and atmospheric tension. Focus on building relentless suspense, morally ambiguous characters, and a twist-filled plot that keeps the audience on edge. Ensure the protagonist's backstory ties meaningfully into the mystery, and the climax delivers a shocking revelation.