Elowyn wrote:
my theory
helen was a housemaid in grandfathers house, as to why the photo and letter was in the maids chamber. back in the days the african americans were frowned upon and discriminated, hence why she was a house maid. grandfather had an affair with helen, and this was not accepted in that time. grandfather got more and more in love with her as time went by
since they couldn't say something about their relationship, he had a small affair with miss mellon, and he didn't want helen to find out. she did anyways - the note in the maids chamber
the voice in the common room i believe is mellon talking about helen and mrs leigh
i think that mrs leigh found out about grandfathers relationship from kubrick, he was hoping to destroy grandfathers influence in the business, and mrs leigh found it beneficial for her because she wanted to marry grandfather.
i think different people killed miss mellon and helen, but i'm not quite sure who did, yet.