Eleven-year-old Cinzia is an apprentice to printer Mestra Aronne, who teaches her about the importance of trust in the city and speaking the truth. When Mestra Aronne is arrested for printing an accusation about the corrupt Lord Magistrate, Cinzia is determined to clear her name. She allies with a new group of friends, including royal princess Elena, who help her gather clues that prove the allegations and help win public support to free Mestra.