Decent enough story, which kept me turning the pages. It's made more interesting in that the crimes around which the plot revolves were historical. Some nice set pieces, and lots of allusions to Poe's writings to satisfy the likely readership of gothic enthusiasts.
My main gripe is that loose ends are deliberately left dangling, to encourage purchase of the sequel, no doubt. I'd have appreciated a little more closure after sticking with 398 pages.