Blue is an orphan who disguises herself as a newsboy. There's a war going on, and girls are expected to help the struggling economy by selling cookies. But Blue loves living and working at the Bugle, the only paper in town that tells the truth. And what's printed in the newspapers now matters more than ever. But Blue struggles with her secret, and worries that if her friends and adopted family at the Bugle find out that she's a girl, she'll lose everything and everyone she cares about. And when she meets and befriends Crow, a boy who is also not what he seems, together they seek the freedom to be their true selves... and to save each other.

Blue arrives in the capital city of Altalus, where she is determined to find her friend Crow, the boy who was created to be a flying war machine, and Jack, the engineer who built him. But soon she is inadvertently kidnapped by Snow and Red, twins from the enemy side of their ten-year war. They set off on a dangerous adventure that brings them to the front lines of the war, and eventually realize that they must work together to help end it. But with larger, more powerful forces at work, the fight for peace—and survival—will be more difficult than they ever imagined.