This was an enjoyable steam-punk retelling of Cinderella. Cinder is a cyborg mechanic who can’t remember her life before the accident that claimed her parents and made it medically necessary to replace her leg and other parts with machinery. She was adopted but her new guardian dies before he is able to bring her home to his wife and daughters and tell them why he has adopted a cyborg child. She works to make money for her stepmother and keep their household afloat though they treat her like a servant.
A plague is running rampant throughout their country and attacking young and old, rich and poor alike. Her favorite sister becomes ill days before a ball is planned. She tries to encourage her sister by telling her how she met the prince when he brought an automaton to her shop for repair and how he invited her to the ball. She promises to get the prince to dance with her sister if she will just get better and be able to go to the ball.
The prince has troubles of his own. His father is gravely ill with the plague. The ruler of Mars is on her way with an entourage to discuss peace talks that all his advisers believe is a prelude to war. Of course, the prince could marry the queen of Mars and make her his Empress ensuring peace but would that really be the best thing for both planets?