What is the setting of the story the girl tells and how does this setting add to the atmosphere of her story? "The Open Window" by Saki

In 's
"," there are actually two settings:  The home of the Stappleton's where Framton
Nuttel sits captive to the "tale of " that Vera weaves.  In this room, where "an
undefinable something ...seemed to suggest masculine habitation," the open French window
serves as the frame for Vera's tale of the outdoors where Mr. Stappleton and his
brothers supposedly went hunting three years ago.

In the first setting,
Framton Nuttel waits rather uncomfortably for the appearance of his hostess, Mrs. Stappleton. 
She has sent her niece down the stairs to keep him company, and this "very self-possessed
young lady of fiteen" takes advantage of Nuttel's lack of knowledge of the area and its
people by creating her tale from the literal and figurative framework of the open
window.

Because she employs the window, there is a suggestion of openness and
truth to Vera's story. Added to the "undefinable something" that suggests the presence
of men, Vera's story of men having set out for their day's shooting becomes real to Framton
Nuttel.  In addition, Vera's mention of a moor certainly adds mystery as this area connotes fog
and mystery and Emily Bronte's gothic novel Wuthering Heights set on the
moors where places give "way suddenly without warning."

Out of his
own environment, Framton Nuttel is rather uncomfortable; then, with the setting of the expanse
which Nuttel perceives through the open window, an expanse "engulfed in a treacherous piece
of bog," the setting greatly contributes to the mysterious  of Vera's deceptive
tale.