I've never read any Lovecraft works and it seems that the extremely negative reviews here all come from dedicated fans upset about something. If you look at the episode on its own, it's pretty solid... Very good, even. Rupert Grint anchors it well as the lead character, not that this should surprise anyone, and the episode itself is filmed well and structured well. The real sense of a brother's desperation is palpable from Grint as he continually searches for a way to connect to his long lost twin sister. As with other episodes the attention to visual detail is excellent. The story carries a message, I think, of "life being for the living". To grieve is one thing, to obsess is another, often damaging our lives deeply.