Episode 14 - The Emptiness Within | Regency Cthulhu 

Fun fact, Arsenic IS actually medicinal in small quantities for several medical conditions, it's just that we have better medications now that don't have the downside of potentially poisoning you as easily from the wrong dose and stay in your body for more reliable periods of time so it doesn't build up. Rule 1 of medicinal chemistry is that it is the dose that makes the poison, because even water is lethal at high enough concentrations.

Topping of with a bit of mythos

Very relieved plan C was not required

Jennings is the dad friend