Light. Easy to read, but ultimately not that compelling. I was unable to manage the requisite suspension of disbelief - since the books was ostensibly set in our universe, I would've needed a lot fewer people to know about vampires than did in order for the story to be believable.
Other complaints include the [sic]s inserted in passages torn from Abe's journals, even when those passages included vampire references - if we're going to use a fictional entry, why insert spelling mistakes? Also, the use of the journal entries was distracting - we'd jump in and out willy nilly.

It wasn't a terrible book, given what it was supposed to be, but not nearly as interesting an effort as P&P&Z.