The spirit of a young girl named Premika resides in a karaoke booth. When it is accidentally switched on, her spirit awakens from death and haunts those who sing terribly.

The Inspector Wasan, a cop under investigation by internal affairs but called back to duty to investigate the murder of a minister's daughter. He's joined in the investigation by Sergeant Thong and the young female officer Lieutenant Nalin, whose investigative style is the opposite of Wasan's. Meanwhile, the killer has Wasan in his sights, setting out to ruin him by exposing his role in a previous...