Whether it is day or night , there are always different types of men going in and out of this old building in Sham Shui Po. Clearly this is no ordinary building. The corridors inside the building are decorated full of colorful neon lights. In front of every door, there stand a half naked sexy woman. After all, it is the most famous red-light district in Hong Kong.
Li owns a few of the apartments in the building and she earns a living by renting them out to the prostitutes. To the prostitutes though, she is more a friend than just a landlord. However, this old building will soon be demolished as a part of the urban renewal plan. Despite the constant harassment and threats from the triad, Li is not giving up on the apartments. She gets together a group of prostitutes and work as hard as they could, trying to attract business to turn the tide. Still, they do not know they are quietly approaching death.
It begins with the missing of a prostitute Ping. Ping is one of the tenants who live with her young daughter. The news of Ping’s disappearance disrupted the Chinese New Year dinner party of the building. Initially, they think it was the triad who kidnapped Ping and wanted to resolve the problem privately.
In the process of finding Ping, however, more questions rises. Li discovered there had been a lot of missing prostitutes in this building, yet none of them were found. As the truth starts to unfold, more prostitutes were killed. The building was somehow isolated from the outside world and a massacre begins.
In one night, Li and the prostitutes has to find Ping and to fight a battle of wits with the invisible murderer. Li even suspected the murderer is hidden inside them. As more evident of the murderer’s identity revealed, a tragic truth hidden for over twenty years starts to unveil.