I recently finished reading José Saramago's novel Blindness.  From Wikipedia:

Blindness is the story of an unexplained mass epidemic of blindness afflicting nearly everyone in an unnamed city, and the social breakdown that swiftly follows.

I enjoyed it...enough to go ahead and order and start the sequel, Seeing.  I  couldn't help thinking of The Road (another society in extreme crisis).  With an exception or two (one of them big), Blindness didn't explore the potential for evil, for the strong to prey on the weak, to the extent that The Road did.