Kitty Goes to Washington - Carrie Vaughn
Kitty Goes to Washington literally follows on right where the previous book (Kitty and the Midnight Hour) finished, with late-night radio host Kitty Norville leaving town after she breaks with her pack (since she's also a werewolf) and goes on the run across country. While travelling, broadcasting her show from various parts of the US, Kitty gets a call to say she's been summoned to a Senate committee hearing on the supernatural creatures the US government has now found are living among them.

While she's there, we meet a bunch of new characters, as well as some familiar faces from the previous book, and things kind of resolve themselves just in time to set up the next book in the series (Kitty Takes a Holiday) which is currently part of my teetering to-be-read pile.