From the back cover:
Some twenty years from now, the United States is near total collapse. But 85 percent of the population doesn't care: They're addicted to flashback, a drug that allows its users to re-experience the best moments of their lives. After former detective Nick Bottom's wife died in a car accident, he started going under the flash to be with her; now an addict, he's lost his job and is estranged from his teenage son.
Nick may be a tortured soul but he's still a good cop, so he's hired by a top government advisor to investigate the murder of the advisor's son. Soon Nick becomes the one man who can change the course of an entire nation turning away from tomorrow to live in the past.
Simmons draws on the events of the last few decades, ending historically with the first years of the Obama administration, and offers a very dark, possible future. There are ongoing race wars, a new Mexico has reclaimed large swathes of the southwest, Texas is again an independent republic, and most Americans, including the hero, care far more about reliving their glory days than solving the problems.
Although it's science fiction, this is at heart a pulp detective novel with dark twists and turns along the way to solving a murder. Despite its 550 pages, it moves quickly and is a pretty good read. Simmons occasionally takes a break from the action to preach to the reader about obscure things like the disastrous effects of national debt and enabling Iran, but it didn't really diminish how much I enjoyed the book. (Maybe because I agree with much of what he says?) I don't want to spoil the ending, but I will say that it is unusual. If you enjoy these kinds of stories, I highly recommend it.
As a last note, parts of the book feature trucker convoys through the anarchic wastelands of the American West which reminded me a lot of the song Grim posted back at the end of June: