That said, I tried reading his other books and as far as I can tell, he was a one hit wonder, so the deep fascination with him is strange to me.
I read Catcher first and found it just OK. Franny and Zooey was my gateway deeper into Salinger (and Stoicism) back in high school. Liked Nine stories quite a bit on my first visit, but didn't care for Raise High & Seymour at all until a re-read over a decade later, and now that might be my favorite of his books.
The thing is, the other books are a set of tales all about or written by someone of the Glass family. So all three other books work as a sort of programatic novela as a whole.
Which is not only ingenious but revolutionary for the literature itself.
The misticism about his (and his character's) unpublished work is a amazing too.