What's in Annika's library: Dr. Jekyll and Mr. Hyde
Annika’s monologue references Robert Louis Stevenson’s The Strange Case Of Dr Jekyll and Mr Hyde throughout the episode. It’s very convenient that the name of the deceased billionaire is Fabian Hyde. The plot doesn’t appear to be specifically about Halloween, so let’s unpack why the classic gothic horror story is crucial to the episode.
Source: wgbh.org