How and where does the battle between good and evil take place in Stevenson's The Strange Case of Dr Jekyll and Mr. Hyde?

In Chapter 8, entitled "The Last Night," Poole, Jekyll's butler, calls Utterson to Jekyll's house because he is so concerned about his employer.  Poole fears that someone has murdered Jekyll, and that it happened some eight days ago, he says, "'when [the household] heard him cry out upon the name of God; and who's in there instead of him, and whyit stays there, is a thing that cries to Heaven [...].'"  Poole imagines that...

In Chapter 8, entitled "The Last Night," Poole, Jekyll's butler, calls Utterson to Jekyll's house because he is so concerned about his employer.  Poole fears that someone has murdered Jekyll, and that it happened some eight days ago, he says, "'when [the household] heard him cry out upon the name of God; and who's in there instead of him, and why it stays there, is a thing that cries to Heaven [...].'"  Poole imagines that whoever hurt his employer is still in the room, though he cannot imagine why such a person would stay.  He says that for the last week, this person or "'whatever it is that lives in that cabinet, has been crying night and day for some sort of medicine and cannot get it to his mind.'"  Further, he's been sent all over town to try to find a particular drug, and nothing he's brought back has been what is needed. 

We find out that Jekyll/Hyde is desperately attempting to recreate his mixture during this time, that Jekyll has really lost control over his experiment and over his evil nature, though his goodness has struggled with it for quite a while.  Now, however, the struggle has come to a head, as the final battle between good and evil takes place in his rooms: Jekyll, the good, ultimately cannot suppress Hyde, the evil, and now Hyde has nowhere to hide, and the man "'Weep[s] like a woman or a lost soul.'"  Utterson breaks down the door, despite Hyde's pleas, but by the time they enter the room, Hyde has taken his own life.  They find, by the fireside, another piece of evidence of the struggle and of evil winning over good: "a pious work, for which Jekyll had several times expressed a great esteem, annotated in his own hand, with startling blasphemies."  Evidently, Hyde had chosen one of Jekyll's favorite virtuous texts and had passed the time writing obscene notes in the margins.