How does Robert Louis Stevenson explore the duality of human nature in The Strange Case of Dr.Jekyll and Mr.Hyde?

Essay question How does Robert Louis Stevenson explore the duality of human nature in The Strange Case of Dr.Jekyll and Mr.Hyde? How does this theme contribute to the novella horror story with a clearly identified monster figure? In a day and age where we see grotesque violence on TV every day, does this book still portray real evil? Use specific details from the novella to support your evaluation.