Absolutely engrossing. A few, surprising grammatical lapses dropped me out of her world, but only briefly, because engrossing. Although its market probably exists because of Buffy, I was glad to find the story independent of the Slayer world. I read it not for Buffy but for Harry and Aerin and Robin McKinley. A wonderful, absorbing story. I'm a big enough fan of Spike that I wanted more and more Constantine, and more Constantine and Sunshine, but even the tantalizing incompleteness was satisfying.
All books are one book: there was a jeweled goblet in Gertrude and Claudius too.