Here are some specifics:
* Time: Late evening
* Location: A dark and narrow street in London's West End, which is described as "a labyrinth of dingy streets" and "a place where the lamps burn blue and the fog hangs heavy".
* Setting: The street is deserted except for Mr. Utterson and a suspicious figure who appears to be watching him. This figure is later revealed to be Mr. Hyde.
The setting adds to the eerie and mysterious atmosphere of the encounter, foreshadowing the sinister nature of Mr. Hyde and the dark secret he holds.