*I received this book from the publisher through Netgalley. This does not alter my opinion whatsoever. Thank you for the eARC!* 
 Oh my gosh this cover!! *-* 
 This book was actually really cool! I enjoyed it a lot more than I thought I would! 
 This book starts off fast and ends even faster. The pacing was unbelievable! The entire book is a progression of events that you really don't see coming, which was something I really appreciated! Adrenaline-filled and surprising, this book kept me on my toes! 
 And the ending was absolutely cruel. I don't cry often, but I cried. 
 Anyways! 
 As always, I'll start off with the characters. Callie was a surprisingly good character! You completely understand where she's coming from, and why her wills and wishes are so strong. She looks for every possible way to save her sister from a possible future death, and keeps searching why she would do such a thing. She pushes through phobias and hard living conditions just to keep her sister safe from herself. Respect! 
 Logan is so sweet and caring, but also has a dark past. His character really develops throughout the book, going from being a cute crush to being someone with a complicated back story and someone Callie can lean on when she needs to. 
 And the plot is SO COOL! I mean at first the fact that everyone gets 'future memories' at 17 really confused me. So the future is already foretold? Can we not change it? How is a future memory a memory if it's in the future? Wouldn't that totally mess up space-time continuum because you can't go back in time because entropy aka chaos works in parallel with time, so the further you go in time, the more chaos there is / the higher the entropy is and the laws of thermodynamics say that you can't go back in time because it requires too much of a drop of entropy for it to be possible? 
 ... sorry about that... 
 But then I got used to the idea and went with it, and it developed in such a way that it was super cool! 
 And what I really liked is that a lot of people in this futuristic world had 'abilities'. But they aren't powers like you typically see. These are all powers that have to do with the mind, so like telekinesis, mind reading, sending messages between siblings... I really liked that! The plot evolves in such a way that it relies on this abilities. At first I thought they were a bit out of place, but then it was a really nice addition. 
 This book goes from light to dark very quickly. Some times, when Callie was in Limbo, I was actually scared for her and the other characters! Then it goes light again, when Callie and Logan kinda get together in a hidden civilization (so incredibly cute by the way!). And then it goes dark again for the end. 
 THE END! 
 It was so sad but so good and I was just like what no why stop don't do that uh oh too late why wait what is it not done or what? 
 ^Much english right? 
 I REALLY HOPE THERE'S A SEQUAL! IT DESERVES ONE! ONE DOESN'T SIMPLY LEAVE READERS HANGING LIKE THAT! 
 You know the way thy ended the Catching Fire movie? With Katniss looking up angrily at the camera after Gale said "There's no more district 12."? Yeah the ending was like that, but not really. 
 Anyway I have to cut this short cus I still have quite a bit of work to do, but I'm giving this a very nice 5 stars, because it's one of my favorite eARCs so far!