Adrian and Tali launch the newest Ghost Hunting season by talking about the history of spiritualism, Seances, and the Society for Psychical Research. 

More excellent shows about spiritualism and the SPR/ASPR if you'd like to dive deeper:

Occult Confessions: Season 5 Episode 2: Madam Blavatsky vs. The Society for Psychical Research

Last Podcast on the Left: Series on HPB starting with episode 410: There's Something Wrong With Jimmy.