Spoiler
During this quest, I came across this same book that was in Oblivion, in a vampire's house. I just found this so fascinating, that you would only hold any significance to this minor quest if you had read the book before-hand. Turns out, there's a quest involving him in Skyrim, where it asks you to kill him.
I ask,
Is there any information on the "anonymous" author of this book? Also, is it fairly common to experience a situation like this, coming across a character that was perhaps mildly mentioned in a previous Elder Scrolls title? Maybe I'm not reading enough of these books, but it seems most of the side quests requiring you to kill someone, named or nameless, tends to be an insignificant character.
But this vampire really captured me. I would love to get more information, but unfortunately it seems that's where the story begins and ends. I searched all over his lair for relevant books, journals, whatever I could find, and I had no luck.