From the First Golden Age of Heinlein, this is the so-called juvenile (written, Heinlein always claims, just as much for adults) that started them all and made Heinlein a legend for multiple generations of readers. 

About Robert A. Heinlein:

“Not only America's premier writer of speculative fiction, but the great writer of such fiction in the world.”—Stephen King.

“One of the grand masters of science fiction.”—Wall Street Journal

It's a cross-time fight for freedom as a family retreats to a bomb shelter during a nuclear attack – only to emerge hundreds of years in the future, thrown forward in time by the blasts.  There lifeboat ethics rule as they struggle to survive…until they're discovered by up-time humans, the survivors of the apocalypse.  These survivors are of African descent.  Down-time humans – in fact, all of the European-descended – are held guilty for the state into which the world has fallen and designated as automatic slaves.  The only escape is to find a way back down-time, to change events sufficiently to make absolute certain this nightmare future never get a chance to happen in the first place!

About Robert A. Heinlein:

"Not only America's premier writer of speculative fiction, but the great writer of such fiction in the world." – Stephen King. 

"One of the grand masters of science fiction." –  Wall Street Journal

            The saga of the opening of the space frontier as courageous men and women risked their lives to build the first space station and colonize the Moon and Venus, while praying for one last landing on the globe that gave them birth, to return to The Green Hills of Earth.

            From a mysterious region on Earth, where a more advanced lifeform may be studying the interesting creatures called “humans,” to the first moon colony, where a young girl’s relationship with her boyfriend is endangered by the beautiful Menace from Earth.

            Classic Heinlein, in a new two-for-one package.

            Except that two agents of the most secret intelligence agency in the U.S. government were on the scene and disappeared without reporting in. And four more agents who were sent in also disappeared. So the head of the agency and his two top agents went in and managed to get out with their discovery: an invasion is underway by slug-like aliens who can touch a human and completely control his or her mind. What the humans know, they know. What the slugs want, no matter what, the human will do. And most of Iowa is already under their control.

            Sam Cavanaugh was one of the agents who discovered the truth. Unfortunately, that was just before he was taken over by one of the aliens and began working for the invaders, with no will of his own. And he has just learned that a high official in the Treasury Department is now under control of the aliens. Since the Treasury Department includes the Secret Service, which safeguards the President of the United States, control of the entire nation is near at hand .

Unforgettable Heinlein characters on an unforgettable adventure.

"Not only America's premier writer of speculative fiction, but the greatest writer of such fiction in the world".  

  -   Stephen King

            Then there was the ring that an old family friend had given him just before he had left Earth. Shortly afterward, the friend had been questioned by Earth's secret police and had died—from “heart failure,” they claimed. When Earth troops landed on Venus and started looking for Don and that mysterious ring, he realized that he was trapped in the center of a war between worlds that could change the fate of the Solar System forever!

First prize in the Skyway Soap slogan contest was an all-expenses-paid trip to the Moon. The consolation prize was an authentic space suit, and when scientifically minded high school senior Kip Russell won it, he knew for certain he would use it one day to make a sojourn of his own to the stars. But "one day" comes sooner than he thinks when he tries on the suit in his backyard -- and finds himself worlds away, a prisoner aboard a space pirate's ship, and heading straight for what could be his final destination....

July 12, 1939 Perry Nelson is driving along the palisades when suddenly another vehicle swerves into his lane, a tire blows out, and his car careens off the road and over a bluff. The last thing he sees before his head connects with the boulders below is a girl in a green bathing suit, prancing along the shore....

When he wakes, the girl in green is a woman dressed in furs and the sun-drenched shore has transformed into snowcapped mountains. The woman, Diana, rescues Perry from the bitter cold and takes him inside her home to rest and recuperate.

Later they debate the cause of the accident, for Diana is unfamiliar with the concept of a tire blowout and Perry cannot comprehend snowfall in mid-July. Then Diana shares with him a vital piece of information: The date is now January 7. The year...2086.

When his shock subsides, Perry begins an exhaustive study of global evolution over the past 150 years. He learns, among other things, that a United Europe was formed and led by Edward, Duke of Windsor; former New York City mayor LaGuardia served two terms as president of the United States; the military draft was completely reconceived; banks became publicly owned and operated; and in the year 2003, two helicopters destroyed the island of Manhattan in a galvanizing act of war. This education in the ways of the modern world emboldens Perry to assimilate to life in the twenty-first century.

But education brings with it inescapable truths -- the economic and legal systems, the government, and even the dynamic between men and women remain alien to Perry, the customs of the new day continually testing his mental and emotional resolve. Yet it is precisely his knowledge of a bygone era that will serve Perry best, as the man from 1939 seems destined to lead his newfound peers even further into the future than they could have imagined.

A classic example of the future history that Robert Heinlein popularized during his career, For Us, The Living marks both the beginning and the end of an extraordinary arc of political, social, and literary crusading that comprises his legacy. Heinlein could not have known in 1939 how the world would change over the course of one and a half centuries, but we have our own true world history to compare with his brilliant imaginings, rendering For Us, The Living not merely a novel, but a time capsule view into our past, our present, and perhaps our future.

The novel is presented here with an introduction by acclaimed science fiction writer Spider Robinson and an afterword by Professor Robert James of the Heinlein Society.