User blog comment:Unrulyruby100/The Kaldwin Royal Family and Supporting Documentation/@comment-3410662-20130101071427

I remember something a LOT like that in the Flooded District. It was either in Daud's lair or where your gear is. I'd put my money on Daud's lair, since I remember taking a lot of time to read some books after knocking Daud out, but if you're going to look take the time to check both places.

(All the books I read were on the little half-floor thingy above where Daud is standing, so check there first.)