In "The Open Window," by Saki, Vera's awareness of the lack of knowledge from Mr. Nuttel about her family was an important factor to accomplish her purpose of relating to Mr. Nuttel the terrifying story of how her three uncles never came back from snipe-shooting and how her poor aunt always thinks that her husband and her two brothers will come back. This is exposed when Vera asks, "Then you know practically nothing about my aunt?"( ) and Mr. Nuttel answers, "Only her name and address." ( ). by this we can assume that if Mr. Nuttel had asked to his sister more about Mrs. Sappleton's family Vera wouldn't have been able to tell that story.
Therefore, we can also assume that Vera possesses articulateness. This is shown by seeing the change of self-possessed voice to a falteringly human voice when Vera says, "Poor aunt always thinks that they will come back some day ," ( ). this shows that Vera's qualities are splendid because not all people possesses such qualities. By this we can suppose that if she didn't possessed such qualities maybe Mr. Framton wouldn't have believed her story and he would have find out that all that was a joke.
At the end of the story it has little irony when the teenager is asked why their guest ran out that way and she replies saying that he may have ran out like that because of a trauma that he experienced in India many years ago to support this we can see when Vera says, " I expect it was the spaniel," said the niece calmly; "he told me he had a horror of dogs. He was once hunted into a cemetery somewhere on the banks of the Ganges by a pack of pariah dogs- ( ). We can see that both the story she told her guest and the story she told about him were totally a lie. But Vera's self-possession is what really makes the story so confusing that one could be very gullible by believing what she told to Framton until the end of the story where we could realize that is was just a bad joke.