The Penultimate Truth, by Philip K. Dick, paperback science fiction novel
“A masterly tale of political deception from the most significant writer of SF in the 20th century
World War III is raging – or so the millions of people crammed in their underground tanks believe. For fifteen years, subterranean humanity has been fed on daily broadcasts of a never-ending nuclear destruction, sustained by a belief in the all powerful Protector.
Now someone has gone to the surface and found no destruction, no war. The authorities have been telling a massive lie. Now the search begins to find out why.”