Strange Case of Dr Jekyll and Mr Hyde by Robert Louis Stevenson is a narrative about the complexities of science and the duplicity of human nature. Dr Jekyll is a kind, well-respected and intelligent scientist who meddles with the darker side of science, as he wants to bring out his 'second' nature.
He does this through transforming himself into Mr Hyde - his evil alter ego who doesn't repent or accept responsibility for his evil crimes and ways. Jekyll tries to control his alter ego, Hyde, and for a while, Jekyll has the power. However, towards the end of the novel, Hyde takes over and this results in their deaths.