The Cascadia Enclave is the ultimate symbol of the Hoarders' dominance. From behind its impenetrable walls, they continue their relentless campaign to Implant the innocent, while the subhuman Trackers hunt down and exterminate the unfortunate.

The only hope for Amos Morgan, Aubrey Carter, and their band of Runners is to infiltrate the Enclave, and take the fight directly to the Hoarders. But they'll need help from inside the Enclave, and their only guide may be a double agent.

Then there's Tracy. The Hoarders stole her humanity, turned her into a Tracker, and left her for dead. The Runners took her in, but can she be trusted?

One thing is clear: she's on a mission.