Forgotten Lore quest

I can't find any sign of Raissa and Anton keeps asking me for news. On New Garand's tomb supposedly are the remains but I found a secret room there and I think I found anything there. I did Dark Matters quest too.
I found the tomb near Lannegar and the other one where Grissenda was... Is there anything that I haven't see?

in the one near NG, actually. In the middle room with a cage. But if you visited the place before getting the quest, she wouldn't spawn.[/quote]