When Markheim went upstairs he found and encountered a strange person there who seemed to be a supernatural being of some sort.
<u>Explanation:</u>
"Markheim" is a story which has been written by Robert Louis Stevenson who is a Scottish author. This is one of the strongest works of this Scottish author which is a short story written in the year 1884.
The story is about a character named Markheim who has entered in a shop to buy a Christmas gift. The whole story revolves around this incident only in that shop.
Personally, I would say "A" Moreover. Moreover, at least in definition, means as a further matter.
