All Together Dead (Sookie Stackhouse #7) by Charlaine Harris

Sookie Stackhouse would really like time to get over being betrayed by Bill, her long-time vampire lover, and get used to her new relationship with sexy shapeshifter Quinn - but instead, she finds herself attending a vampire summit, the destination of choice for every undead power player around. She's being used as a sort-of human Griger counter for Sophie-Anne Leclerq, vampire queen of Louisiana.

But Sophie-Anne's power base has been severely weakened by Hurrican Katrina, and she's to be put on trial for murdering her king. Sookie knows the queen is innocent, but others have their doubts. And there are some vamps who would like to finish what nature started. With secret alliances and backroom deals the order of the day - and night- Sookie must decide which side she'll stand with, and quickly, for her choice may mean the difference between survival and all-out catastrophe . . .