Treasa lives in a world where people are divided by status and money - literally. The walls sit between the poor, middle-class and rich. Treasa enrolls into a new school - the richest one (they try to look charitable). Finding herself over not one but two walls she's overwhelmed.
As expected the kids are cruel, teasing and snobby. And why not, right? She's originally poor - she doesn't belong in Highest. So what else does a delinquent-new-student do? Skip school. Treasa meets Ryker. He's shrouded in mystery and he offers her a chance. A chance to join his game.
Treasa accepts. She's in the game and when she wants to quit she can't. Things turn violent and Treasa has no other option but to stay until the game - or herself - is finished.