"The Darkest minds tend to hide behind the most unlikely faces." 
 Most of the kids in this era have either died off, or gained supernatural powers which leaves the country afraid of them. All kids that are still alive are sent off to "rehabilitation camps" (aka concentration camps) to be kept away from the general population. Each kid is given a color which describes their power and are separated based on their color and sex. Ruby - our main character - is thought to be green but is secretly orange (the most dangerous color). Eventually she somehow escapes this concentration camp and is sent running for her life into a world she's never known before. 
 (view spoiler)[ 
 Liam is book boy-friend goals (until his memory gets wiped and he can't remember Ruby anymore). Chubs is such a great friend. I hope they find quiet little Zu though I'm happy she left Split kid camp when she did. 
 In the end Clancy - the only other orange - turns out to be evil and messed up in the head (duh). We thought he was helping Ruby for awhile by attempting to teach her to control her abilities, but instead he was just driving her away from her friends and controlling HER. (hide spoiler)]