Ok, I finished Kargan's(spelling?) quest for the book of Kaza. Also noticed that there is another room north of the Spider Lair. I cannot open the doors either by spell or lock pick. Anybody know how to get past the doors??

SPOILER ALERT:

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...it's part of the Chapter 3 main storyline quests. Talk to Aran Linvail first. Eventually, you'll get back there. ;)

-Sazerac

Thanks Sazerac. Thought I had missed something but I am still in Chapter 2.

Do not bother to find the missing parts, when certain conditions are met, the storyline will find you itself (even twice, one after another ;) ) and will make you deal with those doors, one way or another ;)