A humane scientist attempts to explore the most loathsome forces of evil behind the doors of his London laboratory, in a controlled-vocabulary adaptation of Stevenson's classic tale
I suppose in a way this book sort of explores the idea of there being good and evil, and if we refuse to accept it we project evil on to others. There are quite a few ways of interpreting the book as a whole, you could see the book as being a Victorian morality tale of unleashed sexual depravity, or an allegory of the double life of a Victorian homosexual.
The whole book seems to be pretty complex, and while I didn't particularly enjoy it, I'm sure people who like this genre of book will definitely love it. The best bit of course, (well, in my opinion) was definitely the end, when he realizes he can never reproduce the exact formula. Genius in a way.