Cinder and Captain Thorne are fugitives on the run, with Scarlet and Wolf in tow. Together, they're plotting to overthrow Queen Levana and prevent her army from invading Earth. When a daring rescue goes awry, the group is splintered. Cress finally has her freedom, but it comes at a higher price than she'd ever expected. Meanwhile, Queen Levana will let nothing prevent her marriage to Emperor Kai, especially the cyborg mechanic.