锦都府尹黄敏为一方父母官，其女黄梓瑕勤学上进，天性聪颖，正直善良，从小助其父断案，屡建奇功。未料，某日黄府惨遭灭门，唯一幸存者黄梓瑕被诬为凶手含冤出逃。她千里奔袭至北炎，向巙王李舒白求助重审灭门案。适逢北炎城发生“四方案”，李舒白命黄梓瑕查清背后之谜，作为对她的第一个考验。黄梓瑕隐姓埋名，迅速侦破四方案背后关于贪腐和利益的勾结，成为了巙王身边的得力助手。巙王欲着手侦查黄府命案，却被接踵而至的案件困于北炎城内。巙王选亲，琅琊王家之女王若本为有力候选者，却庚帖造假，屡屡被卷入生死危机。荐福寺经会上，有人于大火中丧命，黄梓瑕与李舒白携手并进，终将一桩桩关于亲情、爱情、友情背后不为人知的真相揭露。黄梓瑕的正义善良逐渐融化李舒白冰冷的外壳，二人一同踏上寻找公平正义之旅。

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, accused of murdering her family to escape an arranged marriage. Driven by a single-minded pursuit, she must use her skills to unmask the real killer…and clear her name.

But when Huang Zixia seeks the help of Li Shubai, the Prince of Kui, her life and freedom are bargained: agree 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.