The Little Sisters of Eluria

Short story set some time before the events of the first book. It has nothing to do with the Dark Tower series except for the main character and a small mention of the tower but it's a nice side story set in town called Eluria.
It's written very much like Witcher's short stories by Andrzei Sapkowski and that's the reason why I liked it so much. Especially the romantic ending. I wish this was included in The Gunslinger. That book would've been much better.