It's the End of the World as We Know It (And I feel fine...)
In Wool, the first of Howey's trilogy, we are introduced to a new way of life. People live in a silo underground where their way of life is governed by their specific skill set. Our protagonist, Juliette, is a worker from Mechanical, way down deep towards the bottom of the silo, but she's shown aptitudes that recommend her for a much higher position. So when the sheriff is sent to "clean" (I'll get to that in a moment), she's given the job, much to her astonishment.
Cleaning is the highest capital punishment in the silo. People who commit crimes are loaded into space suits and sent out into an atmosphere largely believed to be toxic in order to clean the sensors that project an image of the outside world (a wasteland) to the people in the cafeteria below. While many say that they won't do this task, without fail, all of them do.
Except Juliette... who is also eventually sent to clean.
You see, the silo system is corrupt, and those the reader comes to see as the good guys can't seem to understand why their simple curiousity gets them sent outside to clean. Their question asking is ultimately good. Even now, we live in a world where we are taught to rationally assess everything, question things that don't make sense to us... so what has happened? In this not too distant future, why has the government suddenly become totalitarian again? And what, exactly, goes on on level 34 where the sinister IT Head, Bernard, works? (You'll just have to read Wool and find out.)
Shift takes place hundreds of years earlier and looks at the origin of the system- as I said, largely based in the US government. An unnamed enemy beyond the Silo is introduced, but is it them who has necessitated this? Congressman Donald Keene begins to doubt this. Meanwhile, in the future, Troy wakes up and begins his first shift underground as head of the silo, but some things don't add up. He appears to have someone else's memories of outside... but whose? (Again, that's all you're getting from me, read the book.)
Dust, the final book in the trilogy, ties the knots between these two narratives, and settles the score once and for all. Is there any way out of the system? Can we go back? Read and find out. Find out why this sort of literature is so important. These books are cautionary tales, and speak of the kinds of futures we can expect if we go unquestioning where we are told. Rebellious and anti-government, maybe. Necessary? Yes.
You can read more about Hugh Howey here.