Book 4 was "From Dead to Worse" by Charlaine Harris. I love the Sookie Stackhouse series. This one was interesting, it seems like kind of a turning point in the series, so it will be interesting to read the next one.
I made the mistake of starting this book before I tried to go to sleep last night. So, starting a book at 11:30 pretty much means staying up until I finish it. So, I finally went to bed around 2. But hey, that's ok :-p