A bunch of people live in an underground community and those who break the rules are cruelly expelled to their doom? Reality TV producers have to be kicking themselves for not coming up with this idea themselves. 
 At an undetermined time in the future, the people of the Silo have lived for generations with only a few dusty camera views to show them the world above ground. After the sheriff steps down from his post in rather dramatic fashion, the mayor and a deputy determine that a mechanic named Juliette is the best candidate to replace him, but her appointment results in a series of events that threaten to expose long kept secrets and tear the Silo apart. 
 Hugh Howey is one of the biggest success stories in self-publishing, and I understand why after the early chapters do an exceptional job of introducing us to this world. The stairwell is a vertical highway connecting the complex, and journeying from top to bottom is no easy task. Having two characters make the trek in the early part of the book was a great way of giving us a tour of the Silo that established not only how it works logistically, but how it functions as a society. Juliette started out as a very strong character against this vivid background, and Howe sets her up perfectly as the hero to carry the story. 
 Unfortunately, he seemed to have some problems with what to do after that, and I was slightly let down at where the plot went from there. I can't say much about that without giving the book away though. (view spoiler)[ 
 I was disappointed that Juliette wasn't given more to do in the sheriff's role and as a character overall. In fact, while Bernard made for a great villain with his infuriating arrogance, he was so ahead of Juliette at every turn that it made her disappointingly passive. While she takes plenty of actions during the course of the story, none of them really accomplish anything. 
 Juliette doesn't uncover the conspiracy; her friend in IT finds the data that clues her into what's going on although she does figure out the bit about the suits being deliberately made badly. Before she can really do anything as sheriff she's almost instantly demoted and sent out to clean and only survives that because her friends swapped the faulty parts of the suit. That kicks off the whole rebellion, but Juliette has no part of it. At the other Silo she spends most of her time trying to get a pump working and almost dies doing so, but again, that doesn't resolve anything in this story. Finally, in the end, she again almost dies because she accidently tries to save the life of the villain of the story, and we learn that Bernard wasn't bested because of anything she did, rather it was all done by other people. 
 Part of this is disconnection is because of the structure of the plot. Sending Juliette out of the Silo automatically cuts her out of the action that takes place for the rest of the story. Her dangers mainly come from her environment, not because of anything connected to the plot although an argument could be made that Howey was trying to put in some kind of theme about her overcoming the elements since she almost dies by earth and air (Surviving the toxins and asphyxiation after being sent out to clean.), water and then fire. 
 One of her Big Damn Hero moments is supposed to be her rushing up the stairs of the second Silo when she's completely exhausted because she's desperate to get back into radio contact with her friends, but what exactly was that going to accomplish even if she had gotten back in touch of them? Essentially the character's major achievement is that she suffers and endures so that she can continue to suffer and endure. 
 So I found it very disappointing that we had a good character that I wanted to root for as the lead in the story, but she felt removed from the action with little actual impact on the plot. It's kind of sad that Howey built up such a great sci-fi setting and then pushed the best character away from it to have her explore something similar but decayed and mostly empty. 
 I was also wishing that the story would have been more than a vast conspiracy storyline. The idea that all the silos were part of some centuries old evil master plan was OK, but I think it would have been far more interesting if the situation in the Silo was the result of internal conflicts that had built up over the decades. Juliette and Bernard at war with each other in the Silo is a story I'm more interested in than just another plot about unspeakable secrets kept from a society. (hide spoiler)] 
 Overall, Howey created a well written sci-fi tale with an intriguing setting that I was very interested in, but unfortunately, I found the plot and actions taken by the characters far less compelling. I don't regret reading this, but I probably won't be checking out the follow-up books to it.