'The Strange Case of Dr. Jekyll and Mr. Hyde' is a novel about a lawyer named Mr. Utterson who investigates strange events between his old friend Dr Henry Jekyll and Mr Hyde. He takes on the role of detective and creates a case-like story detailing the evidence and his experiences. The novel is clearly about a dual personality within one person. In the novel "The Strange Case of Dr. Jekyll and Mr. Hyde" the theme of duality is presented in several ways such as character development, setting and double consciousness. Character development is one of the ways duality is represented within the novel. Seen on a very unpretentious level, Jekyll is a good man, well-liked in his profession, Utterson describes Jekyll as having "all the markings". This is the deterioration of Jekyll because his physical characteristics have changed dramatically throughout the narrative, and his eyes have become 'black' due to the evil side of him that does not care about his appearance but only brings pain to others. The complete exposition of Henry Jekyll's case allows the reader to finally get an inside look at the events of the novel. Jekyll describes in this passage his true feelings regarding the topic of duality: he has "learned to recognize the complete and primitive duality of man." Jekyll thus summarizes his theory of the dual nature of humanity, according to which human beings are half moral and half criminal, yet we are truly one person, not two. Jekyll speaks of these two states of good and evil as "elements." He begins to discuss how he deals with these 'elements', declares that he has 'learned to dwell with pleasure, like a beloved daydream, on the thought of the separation of these elements'. Jekyll here is explaining his goal in his experiments to separate these two