At the conclusion of Cornwell's "Cinderella" retelling Mechanica (2015), heroine Nicolette is living her own fairy-tale happy ending. Since escaping from her vile stepfamily, she's become a successful inventor and dressmaker. Things are just about perfect, especially since Nicolette has almost saved enough money to buy the childhood home that houses her mother’s mechanical workshop. But the King of Esting has once again declared war on Faerie forcing Nicolette and her friends to board an airship and cross the ocean to join the Fey in bloody battle. Mechanical armies and dark magic await them as they uncover devastating secrets and fight for a real and lasting happily-ever-after for two troubled countries and for themselves.