Third in the Vampire Files series by P.N. Elrod...
The time frame on these is really interesting to me. This is the third book in the series and we've barely covered a month's worth of time for the characters. It makes it incredibly tempting to just grab the next book when I'm done with one!
Let's see... plot stuff... Jack and Charles go to New York to see if they can track down what happened to the vamp that turned Jack. They do indeed figure out what happened and we meet her sire as well.
I'm liking that we're starting to get more of a feel for who these guys are and what makes them tick.