In the movie Dark Shadows starring Johnny Depp (spoiler alert if you haven't seen this film) as Barnabas Collins, Barnabas tells Angelique she never wanted his love, that she wanted to posess him, also that she cannot love. That's how I see Edna; she wanted to possess Tom. Angelique also wanted to rise above her station. The only difference is Angelique continued to profess actually loving Barnabas; Edna never did that (black heart in my opinion).

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