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"The places, social context of characters and atmosphere can be used to cover the term "plot

The places, social context of characters, and atmosphere can be used to cover the term setting.

Explanation:

In literature, the term setting refers to the time, place, and environment of a narrative. This concept isn't present only in literary forms (such as short stories, novels, or dramas). It originated in literature but is used in other forms as well, such as movies.

The setting is usually introduced during the beginning of the narrative, called the exposition, but it can change as the plot progresses. It includes the time and place where the story takes and its environment and atmosphere - the climate, weather, or social and cultural surroundings.

in that passage i would say the sentence which best describes the overall impact of the setting is when they mention the absence of people because it suggests that taking a walk at night is unusual.