2.5 
 I have to say I am surprise I liked Day 21 and I'm glad! Why? Simply because I did not like the first book at all, but still decided to give the second book a choice and I am happy I did not lose my time on something I thought I was not going to like. 
 Anyway, I felt that since the story focused only on a few days, it felt less rushed than the first book and the characters came to be a little bit more developped. 
 I liked the introduction of the new Earthling character and still liked to get to see Glass up in the Ark. Yet, I still feel like the story could be so much more if the author would take time to develop the story and the characters deeper, as it still read as very simple and sometimes one-dimentional. 
 In all, it is better than the first book, and I'm glad I did not end my impression on a bad feel.