The plot
The house of Turva (from the third book) are back and has decided to rather than face Fred head they should report him and the clan to the Blood council. They being the organization ruling the vampires specifically. Claiming he is unfit to act as a clan leader and that a clan shouldn't be made up of non vampires.The Blood council sends Deborah to assess Fred as a vampire and clan leader. But also raking the time to teach him what he should know as a vampire and acting as his bodyguard.Of course the punishment should he fail the assessment is death for Fred and all the other members of his clan.
My thoughts
The fifth book and like the others it's made up of several shorter stories. But with Deborah and her assignment being the over arching plot tying them together. It also sheds some more light on vampires their abilities as Deborah teaches Fred.
Despite her mission Deborah doesn't really read as an antagonist. Being generally good humored and helpful both as a teacher and bodyguard. The reason for Fred needing a body guard being things that happened at the end of the last book. But all in all it makes her feel more like a part of the gang all be it one they keep secrets from.
The book also has an interesting take on power and kindness. That it takes power to be kind and that Fred in trying to help people when he doesn't have the power to back it up is putting them in more danger. But also that his kindness makes other people think he is stronger than he is assuming he is on par with the other members of his clan.