Helix is a Corpworker. He has spent practically his whole life in one building, just like everyone he knows. They are not aware of the year or their location. All they have been told is that there is nothing outside the Corporations but wilderness.
Helix's job is to monitor suspicious activity. Spending the majority of each day at his desk, he watches the other Corpworkers via countless cameras. He is skilled and dedicated, regularly adding people to the risk list. His only distraction is Ray, the girl he has kept watching long after she was removed from the list.
When Ray is replaced by an impostor with an uncanny likeness, Helix does not report it. Instead, he finds Ray, follows her and makes sure she does not get caught.
When he discovers where she has gone, the answer has life-changing consequences, not just for Helix and Ray but for every Corpworker.