Summary: Everyone is out to get Dresden and all he is trying to do is save the world.
What makes the Dresden Files work is that Butcher knows when to bend the rules and when the rules need to be held. Dresden is a Wizard. A magical private eye, the only one, that works in Chicago. The series is a mix of hard boiled PI and paranormal thriller.
In this fourth book of the series, Dresden, after defeating a plan to destroy him by the Vampire Court, is being brought up on trumped up charges by the Wizard Court (these are not legal courts, but essentially guild bodies). A number in the Wizard court are not fans of his and are willing to let Dresden be turned over to the Vampires (for interference) because Dresden saved a number of humans after the Wizard Court refused to act. (And if the Wizard Court does not turn him over, the Vampire Court will declare war.)