So there I am enjoying my
mostly bug free dawnguard experience when I get hit in the face with this! I learned about this quest online and when I opened the book (The Atherium wars) to start the quest, NOTHING HAPPENS! Oh, not a big deal right? Just go to the ruin and do the quest anyway right? Not exactly! I went to the ruin and talked to the ghost girl and that was all great, right up until she said,"Grab my journal, we're going to need it". So I search her body and guess what?! NO JOURNAL! Then, I was like, "Oh okay, guess that's no big deal" and tried to talk ghost girl again. Except this time, It locked my screen like I was talking to her, but there was no dialog options.
TL;DR- Quest won't start, Journal not on Ghost GirlI'm certain this is a bug, but if anyone else is having the same problem as me, or has any suggestions, please comment!!