The third daughter, Princess Chiu Yeung, of the Tang Emperor, is known throughout the kingdom for her beauty, but she is also known for her unreasonable and stubborn personality. For this reason, no one wants to marry her - that is, until the second son of the formerly wealthy Kam family, Kam Dor Luk, is persuaded to marry her to save the family business. Princess Chiu Yeung resists the arrangement but realizes that it is a better alternative than being forced to marry the Tibetan king as schemed by her father's evil concubine. When the princess moves in with her personal servants after the marriage, family drama and conflict ensues, but is Princess Chiu Yeung stubborn enough to stay and win the heart of her new husband?

尘封的档案被翻开，紧张感扑面而来。当香港真实奇案成为故事蓝本，陈旧的案件是否能被揭开？在追踪线索的路上，能否突破困局，让真相大白于天下？

香港平均每年發生 34 樁兇殺案，當中不乏轟動世界的奇案，本劇呈現多宗由真實案件改編的香港懸疑奇案：《剖腹奪嬰案》《公仔藏屍案》等等。本劇時間線順延數宗案件鋪展，展現破案經過。警長杜凱斌和女警嚴灼穎因一起懸案而心生隔閡，在一次追查懸案的過程中兩人冰釋前嫌，又在屢次合作辦案中滋長出並肩作戰的情誼。兩人的身分、心態、際遇不斷發展變化，唯一不變的，是他們為受害者伸張正義的決心。