An interesting vampire novel with a number of flaws, none of them fatal. Clark manages to work two of the main types of vampires -- the seductive and the disgusting -- into the same narrative, as part of the same species which ultimately has a magical and not a scientific rationale. And the magical rationale seems to be pretty much original to Clark, playing as it does with Norse mythology and not the more usual Eastern European, Greek or Chinese suspects.
A number of good setpieces are occasionally offset by sudden shifts into what I can only describe as Evil Dead 2 territory, the most glaringly offputting of which is a lengthy battle in a tunnel system beneath a small British town, a battle complete with chainsaw-wielding heroes and hordes of hungry vampires that resembles nothing so much as an Evil Dead battle waged in the steam tunnels of Doom 2.
But there are also a lot of pleasures here -- the opening chapter is a doozy, and is filmic in a good way, and many of Clark's ideas about vampires are a refreshing change from the Ann Rice school of sexy dead people. Clark's sexy vampires are nonetheless, objectively speaking, somewhat disgusting -- it's their powers that make them sexy, which isn't a far cry from the standard Eastern European vampire who avoided mirrors not because vampires didn't appear in them, but because a vampire's true, rotting, corpse-like form was revealed in those mirrors for all to see -- and fear.