The Strange Case of Dr. Jekyll and Mr. Hyde
* A novella written by the famous Scottish author Robert Louis Stevenson that was first published in 1886.
* It is about a London lawyer named John Gabriel Utterson who investigates strange occurrences between his old friend, Dr. Henry Jekyll, and the evil Edward Hyde.
* The work is commonly associated with the rare mental condition often called "split personality.
* In this case, there are two personalities within Dr Jekyll, one apparently good and the other evil; completely opposite levels of morality.
* The novella's impact is such that it has become a part of the language, with the very phrase "Jekyll and Hyde" coming to mean a person who is vastly different in moral character from one situation to the next.