In 2023 America, Jasper is a college graduate who is now a member of a nomadic "tribe" that travels the Southern States in order to survive. They have solar blankets and other small solar devices and sell the energy for food. They have to avoid the local corrupt cops and also carriers of new designer diseases, such as flesh eating bacteria or a polio-like condition. However, Jasper has a cell phone, paid by a married girlfriend he's never slept with. He clings to the idea that they are in love with each other, but their difference in social stature only makes his situation--both physical and emotional--worse.
The novel spans about ten years and in that time that base tribe disbands and characters change and even perish. Basically, their situation starts off bad and gets worse and worse, as society slowly, inexorably collapses.
This is one of the better apocalypse stories I've ever read and a pleasant break from the oversaturated zombie genre. I thought SOFT APOCALYPSE an entirely plausible scenario of the future, particularly with the decrease in jobs and resources. Highly recommended-- you'll read this in few days as it hooks you.