This new true crime documentary series on Netflix has cracked the site's top 10 most-watched show list - and for good reason. The TikTok Killer tells the chilling story of Esther Estepa, a 42-year-old solo traveler who met a content creator named on her trip to Spain, then mysteriously disappeared. The two-part docuseries plays on fears of the worst-case scenario happening while traveling alone and the worst-case scenario of meeting someone online.