Like every young woman in New America, Stella knows the rules:

Deflect attention.
Abstain from sin.
Navigate the world with care.
Give obedience.
Embrace purity.
Respect your chaperone.

Stella can't go out by herself, or spend time with boys except at Visitations. Girls in New America must have chaperones at all times until they marry, so Stella's lucky that Sister Helen is like a friend to her. When Sister Helen dies suddenly, she's devastated, especially when the Constables assign Stella a new chaperone just days later.

Sister Laura is... different. She leaves Stella alone and knows how to get into the "Hush Hush" parties where all kinds of forbidden things happen. As Stella spends more time with Sister Laura, she begins to question everything she's been taught. What if the Constables' rules don't actually protect girls? What if they were never meant to keep them safe?

Once Stella glimpses both real freedom and the dark truths behind New America, she has no choice but to fight back against the world she knows. She sets out on a dangerous journey across what was once the United States, risking everything.