Reds are commoners, ruled by a Silver elite in possession of god-like superpowers. And to Mare Barrow, a seventeen-year-old Red girl from the poverty stricken Stilts, it seems like nothing will ever change. That is, until a twist of fate brings her to before the Silver court. Here, surrounded by the people she hates most, Mare discovers that despite her red blood, she possesses a deadly ability of her own. Fearful of Mare's potential, the king hides her in plain view: betrothed to his youngest son. Trapped, Mare decides to use her new position to bring down the regime - from the inside.