The Strange Case of Dr. Jekyll and Mr. Hyde Chapters 1-4

This book, The Strange Case of Dr. Jekyll and Mr. Hyde, is a book that is written in a peculiar way, but it is still an engaging mystery. Chapters 1-4 were very interesting and stopping at Chapter 4 was bittersweet. The actual mysterious plot starts to develop and pick up. In these chapters we are introduced to Mr. Utterson, Mr. Richard Enfield, Mr. Hyde and Dr. Jekyll. Mr. Utterson is a lawyer and a friend of Mr. Richard Enenfield and Dr. Jekyll. Mr. Hyde comes into the triangle when Mr. Enefield sees him at a suspicious and this special building belongs to Dr. Jekyll. He also finds out thar Mr.Hyde is in Dr. Jekyll's will. He is concerned about Dr. Jekyll's well being and confronts him about the situation and shares his thoughts and feelings about Hyde. Jekyll is a nice man that is concerned about Hyde's well being and tells Utterson he knows what he is doing and makes him promise to leave the situation alone. Time passes and then an incident occurs that adds to Utterson's suspicion of Hyde. A man amed Mr. Carew was delivering an envelope to Mr. Utterson but was delivering an envelope to Mr. Utterson but was murdered by Mr. Hyde. Mr. Hyde and an inspector go tohis house to find that he isn't there. They search the rooms of the house and find a piece  of the murder weapon which further adds to the suspicion. Now they have to figure out the whereabouts of Mr. Hyde, further investigate and solve the case.
These chapters were very intruiging and a quote that caught my attention was "If he be Mr. Hyde," he had thought,"I shall be Mr. Seek" (15). This quote showed that Mr. Utterson knows that something is up with Mr. Hyde and he is determined to find him. It sets up the plot and Utterson's purpose in it. Another quote that caught my attention was, "[...] Mr. Hyde broke out all bounds and clubbed him to the earth. And next mommwnt, with ape-like fury, he was trampling his victim under foot, and hailing down a storm of blows, under which the bones were audibly shattered and the body jumped upon the roadway"(22). This really stunned me and I think it is important because it satisfies Utterson's suspicions and thoughts about Hyde. He is now a suspect and creates the plot even more.
Two questions that I would ask are:
What is the history and background of Hyde and Jekyll, and Utterson and Hyde?
Why is Hyde in Jekyll's will?
Why does Utterson start to investigate Hyde in the first place, and why is he so concerned about Jekyll?