"All human beings, as we meet them, are commingled out of good and evil." After taking an elixir created in his laboratory, mild mannered Dr Jekyll is transformed into the cruel and despicable Mr Hyde. Although seemingly harmless at first, things soon descend into chaos and Jekyll quickly realises there is only one way to stop Hyde. 

Dr Jekyll and Mr Hyde is a novella by the Scottish author Robert Louis Stevenson first published in 1886. 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 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.

R. L. Stevenson (13 November 1850 – 3 December 1894) was a Scottish novelist, poet, essayist, and travel writer. His most famous works are Treasure Island, Kidnapped, Strange Case of Dr Jekyll and Mr Hyde, and A Child's Garden of Verses. According to the Index Translationum, Stevenson is ranked the 26th most translated author in the world, ahead of fellow nineteenth-century writers Oscar Wilde and Edgar Allan Poe.