From further research regarding the original source material, I have decided to make the relationships between Dr. Jekyll, Dr. Lanyon and Mr. Utterson a key element of the storyline leading up to the killing of MP Sir Danvers Carew. Author of 'The Strange Case of Dr Jekyll and Mr Hyde' Robert Louis Stevenson notes that "Dr Jekyll and Dr Lanyon fell out ten years previously when Jekyll delved too deeply into his 'unscientific balderdash'." Here we can conclude that the story will pan over the course of ten years, as Dr Jekyll's abilities and misconduct becomes more suspicious to the surrounding characters.
Stevenson also writes in regards to Mr. Utterson "He was humbled to the dust by the many ill things he had done." This could link to some prior work with Jekyll, in which it is agreed that poisoning unfriendly clients with tainted medicine could work to an advantage. At this point, the player may either choose to locate the clients' house and take care of them stealthily as Mr. Hyde or wait a longer time to secretly administer a fatal diagnosis.
Here I have sketched out some basic furniture and decoration ideas, complete with smashed mirrors and ripped curtains to give the player a sense of history to the experimentation. The idea of installing a secret entrance to Dr Jekyll's lab has also come into question, as his home would be visited on a regular basis.