Hello,

I reached to the point where Raymond awaits near the tower, but I can't enter it. Since I suspected Kalkstein, he won't talk to me and therefore I can't even talk to him about the tower or finish the Alghoul contract.

Is there a solution for this mess?

Thanks

I looked it up in a wiki (I must have chosen different actions because I didn't have this problem). Apparently you can continue with the main quest without Kalkstein's help, you just won't finish his subquest. I don't want to spoil anything to you... Do you have any active quests to follow?