广州末代西关小姐潘梦蝶，曾是一位绝代佳人，如今住在西关大屋中。在将近一个世纪的时间长河里，她坚守着自己的爱情，坚守着家族的秘密，坚守着属于她自己的祖屋……社区民警马思鹏是一位身手矫健、头脑聪颖、乐于助人的人民警察。他接到了一桩名为“代号西关小姐”的涉毒案件。在调查的过程中，马思鹏结识潘梦蝶及其后人叶伊西。随着案件的深入，许多不为人知的秘密随之解开，一场关于警民、亲情、血缘等复杂情感的生死较量即将展开……
The nightmare was about a demonic possession. A long time ago, there was an evil in a small town and it was jealous of the girl and would never let her go, since the devil loved the girl. One night, the evil raped the girl and she became pregnant. After months the girl could not hide her baby, her father figured her secret out and clapped the girl in irons and locked her room door. But the evil put the gun to her father' temple and saved the girl. The father had a stroke and had been sleeping on the bed for three months and died. Time went on and the girl brought a child into the world. Naturally, people who were living in the village heard the story and they did not want to see neither the girl nor the baby since when the baby was born, plants dried in the field, fishes lost in the lake and people had prayed to the god for rain, but nothing changed in the village. People got so angry, dug a hole in front of the fountain, put her into the hole and threw stones at her face. The girl died soon after. The evil went off the deep end, took a revenge of the village and killed everyone except two sisters because the evil wanted them to take care of its baby...
