Snyder creates a world of small hall ways, narrow passages, pipes, vents & Gaps. It's a world full of propaganda that leaves everyone leery of everyone. In it she places, Trella and the scubs, along with them is you. Your right there with Trella as she's squeezing through air ducts, peeking/spying on the "uppers" . I'll admit while reading it I thought, mmm.."I wonder if this is like the book Incarceron?" but honestly it's not. The whole time reading it I wanted to know the same thing Trella wanted to know, "What's Outside?"
The sequel comes out this month and I've already placed a hold on it = )