I need to understand the representation theory of $S_n$ (symmetric group on $n$ letters) and so could someone suggest a good reference for this. There is a similar question on mathoverflow here 

https://mathoverflow.net/questions/2755/a-learning-roadmap-for-representation-theory 

Most of the responses to the above question give references for representation theory of Lie groups. Also the usual reference Fulton and Harris has too many exercises (on which I don't want to spend too much time ) and I find it difficult to read. 

Another reference which was suggested was Flag varieties by Lakshmibai and Brown. This seems to be a good reference, but are there any other references.

EDIT: By mistake I did not notice something in the above mentioned book and so some of my remarks are being edited. Sorry.