In 1826, William Morgan, who lived in Batavia, New York, advertised that he was writing a book that would expose the secrets of the Freemasons. And then he vanished.
Research:

Unearthed! In Spring 2026, Part 1
43:14

SYMHC Classics: Gustave Courbet
40:51

Behind the Scenes Minis: Oh, Kropotkin!
17:28