The first of the Anita Blake novels not to be named after a place in the book, The Killing Dance centers on assassins: specifically, the ones who are anonymously hired (for half a million dollars) to take out our heroine
The book also gives insight into Anita's ever-more-strange relationship(s) with Jean-Claude (the Master of the City) and Richard, the challenger to the Master of the werewolves, and Anita's growing psychoses: what does it mean to be one of the monsters?
when is it ok to kill?

The whole series, read in order, is a nice subtle look at what combat-hardened really means...