Thanks for your help with finding Korgan's book, Now the problem is that his friends aren't at the Copper Coronet. After finding the tomb ransacked, we went straight to Pimplico's and found him dead. Then we went directly to the Copper Coronet, but they weren't there. I have completed the Slaver quest if that would have any effect on this.

SPOILERS:
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Korgan's "friends" are not in C.C., check the roof top of the building outdoor.

SPOILER (AGAIN):
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Slave quest is independent of Korgan's quest, they are two separate things.