julekmeister: Maybe the problem is with Kiyatawa. I indicated her as a murderer before this quest begun. She escaped and is no longer enywhere to be found. Although I have an entry in my quest log stating she is one of the women but when I spoke to her, I don't remember noticing she was similar to other gorls. Could that be it?
If it says in your log that she's one of the women, then she should appear.
Generally only one of the women will appear at a time - as a white ghost shape - then when you approach this "person" (or try to talk to it), it should dissolve and the fathom should expand to show more. At this point the ghostly woman will materialise next to you and chat with you some more about what you've uncovered.
Then look for the new ghost-shape, approach that, etc.
One gives you the scene of Tabaht fighting. Another gives a "room" with some more machines and a "coffin" of sorts. Another causes the guy to appear (who messes with the machine). The final one should cause the room with the "coffin" to be engulfed in flames.
If you haven't found the above, maybe check out all of the Daughter's Fathom and see if there are any ghost figures (apart from the main girl) and/or just run everywhere to see if something triggers.
If nothing triggers even after the above, then it's probably a massive bug.