Strange Case of Dr Jekyll and Mr Hyde is the original title of a novella written by the Scottish author Robert Louis Stevenson that was first published in 1886. The work is commonly known today as The Strange Case of Dr. Jekyll and Mr. Hyde, Dr. Jekyll and Mr. Hyde, or simply Jekyll & Hyde. It is about a London lawyer named Gabriel John 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 spuriously called "split personality", referred to in psychiatry as dissociative identity disorder, where within the same body there exists more than one distinct 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. [Reception] Strange Case of Dr Jekyll and Mr Hyde was an immediate success and is one of Stevenson's best-selling works. Stage adaptations began in Boston and London and soon moved all across England and then towards his home Scotland within a year of its publication and it has gone on to inspire scores of major film and stage performances. The Strange Case of Dr Jekyll and Mr Hyde was initially sold as a paperback for one shilling in the UK and one dollar in the U.S. The American publisher issued the book on 5 January 1886, four days before the first appearance of the UK edition issued by Longmans; Scribner's published 3000 copies, only 1250 of them bound in cloth. Initially stores would not stock it until a review appeared in The Times, on 25 January 1886, giving it a favourable reception. Within the next six months, close to forty thousand copies were sold. The book's success was probably due more to the "moral instincts of the public" than any perception of its artistic merits; it was widely read by those who never otherwise read fiction, quoted in pulpit sermons and in religious papers. By 1901 it was estimated to have sold over 250,000 copies. [Adaptations] There are dozens of stage and film adaptations of the novella, over 123 film versions alone, not including stage and radio versions.