This 2018 episode tells the story of the elusive French psychic Maria Duval. A letter arrives in the mail from Maria, she warns you of danger, but promises good fortune — if you send her money. This is the setup for one of the longest-running scams in U.S. history. These predatory letters were sent to millions of Americans and raked in over $200 million. Who is Maria Duval, and is she really the mastermind of this fraud scheme?