I thoroughly enjoyed this book. It is about vampires but do not let this put you off. It is all set in a very plausible way - forget bodice ripping and Romanian accents! I think it would make an excellent reading group book as it has some very interesting themes. It is a cult classic written in 1954 and set in the then way in the future 1976.
It has been made into 2 films The Omega Man with Charlton Heston and the more recent excellent Will Smith version.
In my view this deservedly rates cult status, the sense of desolation, isolation and at times desperation remain with you after the novel has finished. The scenes with the dog are just heart rending - there may be tears.........
Finally why not read the book and then rent the movie, available both from a library near you!