Admittedly I was worried about trying to read a science fiction novel, but The Tenth Planet, by Dean Wesley Smith and Kristine Kathryn Rusch has been a really nice reintroduction to the genre.
I'm currently about 80% of the way through book 1 of 3, but each book is only about 250 pages, give or take.
The story is about a pair of archaeologists who independently discover a thin layer of black "soot" at dig sites that, upon carbon dating, are discovered to exist at regular intervals of 2,006 years. Oh, and the most recent happened about 2,005.5 years ago. Uh oh.
It's not the most scientifically accurate book ever and the characterization can be a little juvenile given the education levels of all the players involved. I also get bugged when authors give you the alien point of view (yes, aliens are involved; it's sci-fi, isn't it?) and ascribe human intricacies to their behavior. I'd rather books just stick to the human perspective.
But, despite my issues, it's keeping my interest and that's what matters.