Dr. Jekyll is not himself and is seemingly unrecognizable.

Possibly fears running into Mr.Hyde.

Dr.Jekyll's reputation is diminishing which could explain the decreasing appeal in his appearance making him look "ill".

They seem to conceal Mr.Hyde's actions while also concealing the fate of Dr.Jekyll's reputation.

Similar to how Jack the Ripper's victims were discovered.

A man only favored by Dr.Jekyll (Mr.Hyde)

A horrible murder covered up by darkness.

Previous character descriptions point to Mr.Hyde.

Seemingly respectable men that seem to fit into the Victorian era concept of "perfect gentlemen." (well educated, good reputations, etc.)

He presents himself as a man of stature which could imply that he is influenced by the concept of being a "perfect gentlemen" in the Victorian era.

This number is constantly repeated throughout the text. There are three windows, it was three o'clock when Mr. Enfield was returning home, etc. The number three is a significant number in Christianity and its subtle repetition can be hinting at the conflict between science and religion that is notable in this era.

Ruining ones reputation, which in Victorian England was equivalent to death.

Description implies something sinister about to be mentioned. In this case, it references "the man [trampling] calmly over the child’s body and left her screaming on the ground."

Appearance is everything

Important in maintaining a respectable reputation

Possible foreshadowing - these secrets might be revealed.

The term "hissing," when referencing Mr.Hyde, makes me think of a snake, which in several religious texts is often connoted with the devil or other evil beings. This diction ultimately paints Mr.Hyde in a negative way.