The story of Tiffany Dover begins, ironically, in a moment of hope. The COVID vaccine is finally arriving in communities across America. Tiffany, the head nurse in her hospital’s COVID unit, proudly gets the shot, and then faints while taking questions about it. As she falls into the arms of the doctors standing behind her, the local news cameras turn away. By the time she returns to the podium 20 minutes later, a new conspiracy theory has been hatched: Tiffany Dover had died and been replaced by a body double. Brandy Zadrozny sets out to trace how the theory started, and to find the people who are keeping it going—those who truly believe that vaccines kill, and those who are just addicted to the game.