No home, no family, no nothing.

This is how Rose and her sister Snow have lived for their entire lives: hiding in the bowels of Rove City, begging for scraps, and relying on the kindness of the mysterious Baron for survival tips—all while avoiding security bots, stealing to survive, and doing everything within their power to avoid capture.

Then comes the purge.

The city suddenly begins changing security schedules, doing random maintenance, and arresting anyone who is in the wrong place at the wrong time. Not to mention, the mysterious Baron, who has helped them so many times before, seems to have disappeared. And there's nothing Rose can do.

Or so she thinks.

The purge sends the sisters fleeing into the main levels of the city where they must hide in plain sight, protected only by their wits and the strange appearances of a stray dog. Rose quickly begins to realize that the way they are living their lives is unsustainable. No matter how hard they try, how fast they run, or how well they hide—eventually, they will get caught.

Unless she can find the Baron.

With the help of her new friend Aspen, Rose risks everything to find out who this mysterious Baron is, so together they can help save every underdweller in Rove City.