In a world of birds, Robyn Swift, a swallow in the Royal Courier Service, discovers she carries a terrible decree from King Rauch to one of his most ruthless commanders. A fateful choice plunges Robyn and her companions into open rebellion. Robyn scrambles to survive while gathering allies for the outmatched rebels.
An ambitious prince, a vulture with a flair for assassination, and a vast, poisonous desert all stand between Robyn and her mission. As these terrible dangers spiral ever closer, how can one tiny bird survive?