You get a higher attack multiplier for attacking while sneaking with a melee weapon...

I'd trash the whole marksman thing if I were you, I hardly use bows and arrows unless absolutely necessary and I get along just fine. But if you're gonna go for magic, I recommend the Battlemage class, simply because you get quite a few awesome spells to work with.

Right. So not having played a SH game before, I got the third because it was relatively cheap. So yeah, I'm on the shakespeare puzzle in that bookshop, and the puzzle is ridiculously easy, I know the code, but regardless of what I put in, the door won't freaking open. Also, the code the books are giving me is three digits, and every walkthrough I've looked at says it needs to be four.

I'm really puzzled because I should have breezed through this a long time ago but I dunno WTF is going on.