Half the Blood of Brooklyn, by Charlie Huston
Third in the Joe Pitt series by Charlie Huston.
Joe is now working for one of the clans instead of going it alone. Which is how he ends up having to deal with a war between a couple of smaller clans in New Jersey. His girlfriend is also not doing well and he ends up having to finally make a decision regarding infecting/saving her or letting her die.
For some reason this one struck me as a lot more violent and crude than the previous two. There were a number of parts where the language and events bothered me, which isn't something I remember happening in the first two books. I have no idea if the series has actually escalated or if I'm not remembering the previous books accurately.