The concept is simple - no one lies except for those who are trying to escape the typical Big Brother government. It is a short book and is only moderately satisfying. I'd suggest reading George Orwell's 1984 instead of this book if you haven't before.
The premise of this book was quite clever, but Morrow ofet has his characters disobeying rules which he created earlier ni the book. It's worth a read if you liked Morrow's other books.