Stevenson drew inspiration from several sources. One was Deacon Brodie, a Scottish cabinet-maker and city councilor who during his “me” time was also a housebreaker – a burglar, in the common tongue. This dichotomy of character – on one side, a respectable public figure and on the other, someone who burgles people to fund his own gambling habit – interested Stevenson greatly. How could such a good man live such a double life? Another inspiration came in the form of Eugene Chantrelle, a French teacher & friend of Stevensons who was later hung after having been convicted of murdering his wife, Elizabeth Dyer. Stevenson found himself shocked that a person of such respect could commit acts so heinous (Chantrelle, it was thought, had murdered many more people before his wife).
The duality of human nature, as well as the private nature of a person, are two of the more obvious themes of the book. How one presents themselves in public is not always congruent with their private personalities. While most are not as different in their personalities as Jekyll is from Hyde, there are differences. The subtleties between the public and private self bridge the two to form the person in whole. Whether they think that is an accurate representation of themselves, however, is another matter entirely.
If you want a physical copy of the book, you can purchase it here. If you want to enjoy some movie adaptations, here are a few. That does not begin to cover it. There are more than 100 films and countless other adaptations, derivations, and other works influenced by Jekyll & Hyde.