In Robert Louis Stevenson's novel, The Strange Case of Dr. Jekyll and Mr. Hyde, Dr. Jekyll tells Utterson at the very beginning that Jekyll and Hyde are tied closely together, but he will give no details.
'...there is one point I should like you to understand. I have really a very great interest in poor Hyde...I do sincerely take a great...interest in that young man; and if I am taken away, Utterson, I wish you to promise me that you will bear with him and get his rights for him.'
Utterson agrees, though having met Hyde, he has found him rude and unlikeable.
Some time later a horrendous crime is committed. Sir Danvers Carew—a gentleman—is murdered one night. A maid, looking out her window as is her custom, notices two men speaking. The first is the old gentleman and the second she recognizes as Hyde. All of a sudden, Hyde attacks the old man and bludgeons him to death with his cane. The matter is brought to Utterson's attention.
'And perhaps you can help us to the man.' And [the officer]...
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