The Night Hunters

What the police (and readers) need is "motive, means and opportunity". The motive in this book is absurd. Not just absurd in relation to the real world, but absurd on its own terms. There are, however, some good scenes of suspense with the protagonists (a knockout geneaologist (!) and a two-fisted ex-Ranger librarian (!!!)) pushed to their limits in a hostile nightscape.