Season 1 Episode 6: She had one true friend, and it came in powder form. 

Voice acting: 

Lynne Kearney and Scott Mort

Music: 

Deadly Roulette by Kevin MacLeod
Link: https://incompetech.filmmusic.io/song/3625-deadly-roulette

To the Ends by Kevin MacLeod
Link: https://incompetech.filmmusic.io/song/4532-to-the-ends

Trio for Piano Violin and Viola by Kevin MacLeod
Link: https://incompetech.filmmusic.io/song/4546-trio-for-piano-violin-and-viola

Wagner Bridal Chorus by Kevin MacLeod
Link: https://incompetech.filmmusic.io/song/4599-wagner-bridal-chorus

The Snow Queen by Kevin MacLeod
Link: https://incompetech.filmmusic.io/song/4511-the-snow-queen

Licenses: http://creativecommons.org/licenses/by/4.0/

Sources:

World Famous Gaslight Murders by Colin and Damon Wilson, accessed via murderpedia. 

The A to Z Encyclopedia of Serial Killers by Harold Schechter. 

The North American Review. United States, University of Northern Iowa, 1895. 

Written in Blood: A History of Forensic Detection. Colin and Damon Wilson. 

Narratives of Remarkable Criminal Trials. Paul Johann Anselm Ritter von Feuerbach and Lady Lucie Duff Gordon. 

Alexa R. Shipman on Science Direct.com