The unimaginable has happened. The world has been plunged into all-out nuclear war. Sailing near the Arctic Circle, the U. S. S. Nathan James is relatively unscathed, but the future is grim and Captain Thomas is facing mutiny from the tattered remnants of his crew. With civilization in ruins, he urges those that remain—one-hundred-and-fifty-two men and twenty-six women—to pull together in search of land. Once they reach safety, however, the men and women on board realize that they are earth's last remaining survivors—and they've all been exposed to radiation. When none of the women seems able to conceive, fear sets in. Will this be the end of humankind?