Feast of Fools is the 4th in the Morganville vampire series by Rachel Caine. Vampires and humans have lived pretty peacefully in Morganville with Amelie in charge of the town. There is always a bit of a power struggle between Amelie and Oliver, but nothing of the likes to what the city sees when Bishop, Amelie's father, shows up in town.
Claire and her friends Eve, Michael, and Shane are immediately put on notice when Bishop shows up at Glass House. Bishop wants to take over Morganville and end the co-existence of the vampires and the humans. Amelie must host a formal ball to welcome Bishop to the city, and it is only at the ball where Claire realizes that Bishop will end the relatively safe living conditions in Morganville.
Caine leaves the reader wanting more and perfectly sets up the next book in the series.