The biggest disservice to reading the book would be to go in expecting a completely science fiction setup: space travel, aliens etc. I am not denying that the science fiction part does exist but it is but a background for intense character analysis. I did not remember much of the blurb when I started reading and later felt that this might have been a big part of why I enjoyed the book as much as I did.
It is the year 2012 and it has already been a decade since an alternate planet similar to our own has been discovered that will take 23 earth years to reach. A group of children have been chosen, trained and six of these chosen get to go first to Terra-Two and get the place ready for more civilians if their mission is a success. The group of six and the adult (more experienced) astronauts guiding them set off on this mission with varying levels of enthusiasm. In order to have them younger when they do reach the planet, the contenders are chosen from a very young age and groomed for this eventuality where they will never see Earth and their family again. In such a drastic setup, things do go wrong but before anything external comes into play the people have to live in close quarters as well as with prior prejudices and newer ones. All of these factors add up to a very stressful environment. How each person attempts to dispel the tensions and how they function is the core of the story. Reading this amounts to a character study to try to predict the next step they would take considering the situations they end up in.
Overall it was a surprisingly quick read, I ended up spending all day with it and only kept it aside once I was done with it
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I received an ARC thanks to the publisher and NetGalley but the review is completely my own opinion