During the reign of Emperor Yizong of the Tang dynasty, Huang Zixia is a renowned female investigator known throughout the land. In a single night, she goes from a gifted sleuth to the murderer of her entire family, becoming a wanted fugitive hunted across the realm. Li Shubai is a prince, yet he is cursed with widowhood, disability, and loneliness, a curse he cannot escape. When the emperor arranges his marriage, his prospective princess behaves suspiciously, and the curse of widowhood is about to come true. Huang Zixia flees alone to the capital to clear her name. By a twist of fate, she encounters Prince Kui, Li Shubai, along the way. After seeing through her identity, Li Shubai agrees to help her reinvestigate the bloody case involving her family. In return, she must take on the identity of a junior eunuch in his household and investigate the mysteries surrounding him. Spring lanterns dim as the winds rise; rain passes, leaving the years in sorrow. Following a trail of fragmented clues, Li Shubai and Huang Zixia travel across the land. From Jiangnan to the northern frontier, from the palace to deserted villages, the truth behind a series of baffling cases threatens to topple the entire Tang dynasty...