Book Reports / Help framing a case study of Jekyll and Hyde and two of its adaptations [2]

I have to do a (3000 word) case study on Stevenson's Jekyll and Hyde and its 1931 adaptation (starring Frederick March and directed by Rouben Mamoulian) and the 1996 film Mary Reilly and address the process of adaptation itself. I have to make my own question/angle through which to study them and I can't think of anything. I really work better when provided with a question I can answer so this is awful for me. If anyone can help me out, that would be amazing!