Cinder and her allies are joined in the plot to overthrow Queen Levana by the queen's stepdaughter, Winter, who has long been defying her evil stepmother's wishes by harboring feelings for her personal guard whom she is forbidden from marrying.

As plague ravages the overcrowded Earth, observed by a ruthless lunar people, Cinder, a gifted mechanic and cyborg, becomes involved with handsome Prince Kai and must uncover secrets about her past in order to protect the world in this futuristic take on the Cinderella story.