Henry Jekyll and his alternative personality, Mr. Edward Hyde, is the central character of Robert Louis Stevenson 's 1886 novella Strange Case of Dr Jekyll and Mr Hyde. In the story, he is a good friend of main protagonist Gabriel John Utterson. Jekyll is a kind and respected English doctor who has repressed evil urges inside of him.
Though Utterson eventually realises that Jekyll is involved in the murder of Carew, Utterson keeps this from the police to protect his friend and uphold his reputation as a Victorian gentleman. Stevenson may be criticising loyalty to friends, suggesting that good intentions may cause corruption and disrupt society.