Faller

Day One. No one can remember anything - who they are, family and friends, or even how to read. Reality has fragmented and Earth consists of an islands of rock floating in an endless sky. Food, water, electricity - gone, except for what people can find, and they can't find much. Faller's pockets contain tantalising clues: a photo of himself and a woman he can't remember, a toy solider with a parachute, and a mysterious map drawn in blood.

With only these materials as a guide, he makes a leap of faith from the edge of the world to find the woman and set things right. He encounters other floating islands, impossible replicas of himself and others, and learns that one man hates him enough to take revenge for actions Faller can't even remember.
Review:
Very interesting book.

Soft Apocalypse

What happens when resources become scarce and society starts to crumble? As the competition for resources pulls America's previously stable society apart, the “New Normal” is a Soft Apocalypse. This is how our world ends; with a whimper instead of a bang. New social structures and tribal connections spring up across America, as the previous social structures begin to dissolve.

Locus Award finalist and John W. Campbell Memorial Award finalist Soft Apocalypse follows the journey across the Southeast of a tribe of formerly middle class Americans as they struggle to find a place for themselves and their children in a new, dangerous world that still carries the ghostly echoes of their previous lives.