Act as a seasoned TikTok content creator with 3+ years of experience in viral storytelling. Craft a step-by-step guide for creating an engaging TikTok mystery video that hooks viewers from the first second. Include tips on [CHOOSING A MYSTERY THEME], such as unsolved riddles, hidden clues, or suspenseful narratives. Detail how to use [CAPTIVATING VISUALS], like eerie filters, dramatic lighting, or quick cuts, to build tension. Explain the best practices for [WRITING INTRIGUING CAPTIONS] that tease the mystery without giving away the answer. Provide examples of successful mystery TikTok trends and how to adapt them creatively. End with a call-to-action encouraging viewers to guess the solution in the comments.