At thirteen, investigative prodigy Huang Zixia had already proved herself by aiding her father in solving confounding crimes. At seventeen, she’s on the run after being accused of murdering her family to escape an arranged marriage. Using her skills, she sets out to unmask the real killer and clear her name. She seeks the help of Li Shubai, the Prince of Kui, who asked her to go undercover as his eunuch to stop a serial killer and to undo a curse that threatens to destroy the Prince’s life. Huang Zixia’s skills are soon tested when Li Shubai’s betrothed vanishes. With a distinctively exquisite golden hairpin as her only clue, Huang Zixia investigates—and discovers that she isn’t the only one in the guarded kingdom with a dangerous secret.