It's purpose is to see how concious the writer is about the topic
In paragraph 9, what the phrase "drew him on by artful questions" means is that he questioned him to try to gain privileged information.
He had to find out some information that was very important to him, so he started questioning him furtively so as to get to the bottom of things.
Irving's ending avoids the paradox of horror but denies the reader a sense of relief. What effect does the increase in suspense have on the mood?
It encourages the reader to keep reading
You need a whole essay? I cant do it rn but you can find a lot of helpful stuff online just dont copy word for word