I will be absolutely shocked if the person ultimately responsible for everything isnt Stronghart; despite being serious all the time he was giving off major Gant vibes from day one. Im also guessing that Susatos dad is not actually sick and he was just trying to get her out of the way. She probably knew about the Hound of the Baskervilles because she heard the story from Wilson, and surely his death is gonna tie into this case as well.