A young mother vanishes from Minnesota, prompting her sister to use TikTok to rally a community search. This gripping episode of "48 Hours" follows the investigation into Maddi Kingsbury's disappearance, offering exclusive access to the case from day one. Then, join the "Post Mortem" discussion with correspondent Peter Van Sant and producer Jordan Kinsey as they delve into the power of social media in this investigation and preview evidence for Adam Fravel's upcoming trial. Will justice be served? Watch now!