The backcover didn't give much away as to what the book contains, but I was surprised to recognize several characters. Main character Manfred originates from The Harper Connelly Mysteries and Bobo Winthrop stems from The Lily Bard books. Having read both other series by Harris, it was really fun to know the background story of those characters (though not necessary for understanding this book). As far as I know Harris doesn't draw anything directly from The Sookie Stackhouse books, but there are a lot of supernatural elements. To the point of extreme.
I think the plot was less crucial to the book than showing off all the different special characters. I liked it well enough, but like with the two other series (Harper and Lily) it's not groundbreaking or very advanced. Things are very straight forward - but saying that I still really enjoyed it. Harris' books remains one of my guilty pleasures. Maybe because the simplicity of it coupled with an interesting plot and decently written text always makes her books easy to read and enjoyable.
I did find this book exceptionally odd though, compared to her previous books. I loved that it's set in our modern day (the others are 5-18 years old), but that cannot outweigh the oddness of the plot that seems a bit all over the place, the random selection of characters and most of all; the oddness of the ending. Which just ended. In an odd way. That left me looking like this o__O