No, seriously. This is fantastic. At first I was turned off by the length - I'm pretty impatient when it comes to critiquing - but as I was scanning down to see how long it was, I stopped and read some of it, then decided I definitely HAD to go back and read the whole thing.
So I did.
And I must say, I'm so impressed by this... Your characters are extremely well-developed, and you never seem to write out of their characters. The entire situation is intruiging (although I had to wonder why he was still there, if he technically wasn't a Kasimov anymore, or did I miss that point?) and entertaining.
I admit, I was slightly annoyed by the constant running-of-fingers-through-hair bit, partially because I recognized it almost immediately as a character trait, and partially because it seemed to be mentioned every other paragraph. Stretch it out a little. It seems to be a nervous habit of his, and while he does seem irritated/paranoid most of the time, I think we get that it's his little habit.
There were a few grammatical and spelling errors, as well as some formatting errors - line breaks where there shouldn't be any - but with a quick run-through I'm sure you can catch most of them.
There was one part I wanted to comment on...
Shan rounded on him. “Yeah?” he whispered, enraged at himself, at Livny, at the Kasimov Ideal in general. “Yeah, well maybe it does have a point to it after all and I just haven’t heard it yet because I’m sitting up here high and mighty... with the damn... Kasimovs...”
I'm not too fond with the end of the sentence. I don't think you need to break it up like that. It's unnatural, in my opinion, and that breaks the standard you've formed of completely drawing in the reader with the dialogue.
Other than that, though... Geez. I don't even want to look at my story. Definitely continue this - it's something I really want to follow. Oh, and that ending? Cruel, to leave us hanging like that. But very, very effective. I had forgotten about that part of his dream until you brought it up - excellent use of distraction.
Bravo.
