Yeah, I was looking for recommendations.
I didn't know the whole Jekyll is Hyde thing was a surprise ending. I thought the whole book was him specifically dealing with the fact that his personality was split.
Yeah, the novel is structured as a mystery. The surprise ending is that Jekyll and Hyde are the same person.
All of the movie versions realized (correctly) that the audience already knows this going in, so they just treat it like a werewolf story, with Jekyll transforming onstage early on.
The movies also came up with the idea (which I believe originated with the 1922 John Barrymore film) of illustrating the Jekyll/Hyde split via the two women in his life: his virginal upper-class fiancee and a fallen woman in the bad part of town. This has been pretty much a standard aspect of the movie versions that is nowhere in the novel . . ..