The young man is skeptical about the red room being haunted. The three elder people believe that it is haunted and dare not even go there. Opposites build drama and drama builds tension. This is the perfect example of how opposites build tension. Firstly, we have the young against the old, which also symbolizes the inexperienced against the wise. There is also the conflict between 'skeptics' and the 'wise'. Although they may be wise, the older people have not ever dared to go to the red room. They have become wise as they have heard the stories about the room but none of them has ever had first hand experience of the room.
Repetition is also a device used by writers to build tension. One of the most obvious examples is on the first page.
"It's your own choosing.".
The old man is trying to warn the young man but at the same time he is leaving the 'decision' to him. It is as if the three old people are ridding themselves of their responsibility of the young man. It is their duty, like guardians, to warn the man of what they believe is to be his death.
Another use of repetition is on page two where the old woman keeps on repeating, "this night of all nights." We never find out why that night is important but it gives the reader a 'red herring' question. Although we are going to find out when we read on; we want to have answers and this continues our interest into - "why was that night important?".
The location is critical to the short story. The writer needs to give his story a carefully considered and appropriate backdrop. A short story works through its location, characters, and setting in time and language. These are the ingredients that tie it together and make the mixture complete. In this story, the location is very important. The story is set in a castle. A ghost story in a castle is not a new idea and although it is a rather unoriginal location, it is very appropriate. The old people who inhabit the place cannot use most of it to live in because they are afraid of the 'red room'.