This is a short book. I managed to finish it in a single sitting around the pool on holiday, with only a break for lunch. It's one of those books that keeps you turning the pages until you get to the end. It's a bit like watching a film inside your head. This isn't a sprawling plot with complicated twists and turns. It's very linear, but filled with lots of imagination and enough intrigue to keep you engaged.
The plot is similar to other stories that have come before it ("Lord of the Flies" springs to mind), but the author has put enough of his own stamp to make it unique and worthwhile. I found myself invested in the central characters and their plight and wanting to know more about the mysterious circumstances that triggered the events. However, some of the tricks-of-the-trade were a little obvious at times. There is a cliffhanger at the end of most chapters, for example, and it some of the plot progression was there to give me a guided tour of the world that the author has created.
I would argue that this is a solid book, well worth a recommendation. If you've just finished the Wool series, and are coming to this book expecting more of the same, then you may be disappointed. This is a different book with a equally different, but engaging, style of writing. Another home run from Mr Howey.