if i finished this book so quickly, it wasn't because it was especially action-packed or a page-turner, it was because i skipped some chapters (all of glass') and skimmed through some other parts (mostly the flashbacks). 
 i have three problems with this book: 
 1. it's one that comes from the first book that didn't get better in this one. this book is too nice, harmonic even, too lovey-dovey, not at all about survival or the troubles of being alone as teenagers in a foreign environment. it's like they forget constantly where they are and what could happen to them. and they live in harmony apparently. supposedly there is conflict, but you never feel it, they only tell you about it. 
 2. the pace is beyond slow. it's boring. it doesn't happen anything, but it has so much potential: there is that rogue earthborn group you never get to meet, why? in the colony it was probably happening very interesting stuff, but since that part is narrated from glass' point of view and i cannot stand her or her boyfriend, i couldn't care less. but on the earth there were so much potential left... behind u.u 
 3. there were some twists in this story a bit far-fetched, totally facepalm that made me roll my eyes like crazy every second page or so, i still cannot believe that THAT was in the book, seriously! (view spoiler)[1. one was sasha and wells, ok, i can accept that although it's pretty clear what it's going to happen to the two of them, but those happy walks they took, first to the corn field and then to the half-demolished house, how is that important to the story? *rolling eyes* 2. clarke, lilly and bellamy's story, lilly being bellamy's girlfriend in the colony was the typical coincidence you find in a cheesy soap opera not in a book, and his reaction to clarke's confession about lilly and the fact that he realized later his mistake misjudging clarke just like that, because of reasons, without much talk between them... was so exasperating; and 3. THAT, the coincidence of all coincidences in this book: wells and bellamy are half brothers and they realized that because a quote both wells' father and bellamy's mother used to say... even with wells' flashback, the whole situation was so WTF that i almost threw the book away (i would have done it if it weren't inside my ipad). 4. the explanation the earthborn gave to why octavia was with them. first they say they don't know where they are, but five lines later she comes running to bellamy, whaaaatt?? O.o (hide spoiler)] 
 there was only one thing i really liked in this book: it boosted my Bellarke ship to the max. 
 but sadly i spent the whole book skipping or rolling my eyes to the narrative... it has a great idea behind, but it is too poorly developed. the tv series might not be the best series in the world, but it is better done and developed (including the inconsistencies). 
 thank you to netgalley and little, brown for providing me with a copy of this book