Robert Louis Stevenson's Dr Jekyll and Mr Hyde

As Mr. Utterson (a respected lawyer) and Mr. Enfield (a businessman and distant cousin) are taking a walk, they come across a mysterious looking door. Mr. Enfield is reminded of a strange man connected with that door. That man had run over a girl and as compensation, emerged from the door with a check worth nearly one hundred pounds. The signature on the check is that of Mr. Utterson's old friend, Dr. Jekyll. Furthermore, Mr. Utterson notices that the door leads to a laboratory that is connected to Dr. Jekyll's house. Upon hearing the story, Mr. Utterson goes to his study and takes out Dr. Jekyll's Will. It states that upon the death or disappearance of Dr. Jekyll, a certain Edward Hyde is to inherit the estate. Mr. Utterson is convinced that there is something amiss with the will and goes to Dr. Jekyll to inquire about it. Dr. Jekyll tells Mr. Utterson that there is nothing wrong, and to Mr. Utterson's displeasure, refuses to discuss his connection with the odd Hyde fellow.
Almost a year later, a maid looking out her window sees a man club an elderly man to death. The maid recognizes the murderer as Edward Hyde. The victim is a respected gentleman, Sir Danvers Carew, who is also Mr. Utterson's client. After the murder, Mr. Utterson accompanies a police inspector to Hyde's residence in seedy Soho. Hyde is nowhere to be found. Fearing for Dr. Jekyll's safety, Mr. Utterson confronts him once again about his connection with Hyde. Dr. Jekyll swears that he will have nothing to do with Hyde ever again. He even presents a letter signed by Hyde that states Dr. Jekyll has nothing to fear... (in order to find out the truth...read the book) ;)