Post-nuclear war, dystopian society. (like Orwell 1984...) The protagonist wants freedom of thought... or a return to a happier life...
Strange book. You cannot help cheering for the hero, but deep down you know that the bad guys are trying to keep humanity alive in a time of crisis, and he is not...
To save the world, we all need to sacrifice a little (or a lot) personal freedom. Probably more relevant today than in 1966...
Depressing...