Each book tends to shed some light on some of the different clans, in No Dominion Pitt ventured into the territory of The Hood. The death of a blood dealer in the beginning of Half the Blood of Brooklyn acts as the catalyst for Pitt to venture out into the territory of some new clans to the series. Minor, lesser clans that hold less turf then the major clans do.
One of these clans gave me pause, I may not be the most ardent vampire student but I really had to rack my brain to remember even the slightest
instance of this type of vampire being mentioned. This was one of the highlights of the book. (more)