I confess I was a little wary about this book at first. It' rare for a good vampire book but rarer still for a good one where Dracula is involved. I needn't have worried though as Dracula himself only plays a peripheral role. I believe it's the same in all but the last book. The book itself is mainly about silver knife and the political unrest within London that he escalates (although completely unaware of it). We know who the killer is and learn his reasons for it.
With the political aspect as well as the story revolving round Jack it made for an interesting read. Although, knowing how much Victoria loved Albert it's hard to believe that Dracula was able to persuade her to come out of mourning. I let that one go by though for the sake of enjoying the book. What I loved about it though was the list of both people and fictional characters who made an appearance or were mentioned. All the characters from Dracula made it in there, including Bram Stoker himself who was imprisoned for daring to write the book. A few others included; Oscar Wilde, Dr Jekyll, Moreau, Tennyson and Billy the Kid. There were actually a lot more than that and I wouldn't be surprised if I missed a few. Having looked into the follow ups I believe that in this way they are all similar.
The only negative thing about the book I can think of is that in the first few chapters the reader is inundated with names. It's a little off putting at first but if you keep with it this calms down. I'm looking forward to reading the others in the series although apparently the author has been working on the last book since 2000.