In 3-5 sentences, explain one characteristic of a gothic theme present in The Strange Case of Dr. Jekyll and Mr. Hyde.

It has themes of doubling, meaning that he has two forms of one person and that can also be considered supernatural. it also has a sense of mystery revolving this secret that he must keep. the setting and atmosphere is gothic because it is dark and uncomfortable. the story shows the lack of control of man and the imploration of mercy.