SPOILER ALERT!

Eternity in Death [J.D. Robb]

Eternity in Death (In Death, #24.5) - J.D. Robb

This one I did remember a little bit as I read it.  Eve's reaction to the whole vampire idea was extremely amusing, as was her reaction to Peabody's belief in the same.  It was a little odd that Eve knew so soon who the killer was, but it almost had to work out that way since this is a novella and not a full length novel.