Episode #10 covers the killings of Rudolf Pliel

Sources:

Jack Rosewood, & Lo, R. (n.d.). The big book ofserial killers volume 2: Another 150 serial killer files of the world’s WorstMurderers (Vol. 2). LAK Publishing.

https://newspapers.ushmm.org/events/german-law-authorizes-sterilization-for-prevention-of-hereditary-diseases

https://www.britannica.com/topic/Red-Army

https://trove.nla.gov.au/newspaper/article/28667825

https://www.reddit.com/r/mysterynibbles/comments/n5n76q/rudolf_pleil_the_death_dealer_one_of_the_worst/?onetap_auto=true&one_tap=true

https://www.spiegel.de/politik/hat-der-hering-eine-seele-a-1a1a23fb-0002-0001-0000-000041761885?context=issue

https://peoplepill.com/i/rudolf-pleil

https://languages.oup.com/google-dictionary-en

https://www.helpguide.org/mental-health/personality-disorders/narcissistic-personality-disorder