Assigned by the professor, 5 senior university students were invited to the old mansion belongs to ML.Salukjit, an old elite who welcomes them with her weird attitude. Before the decision to leave or stay has been made, ML.Salukjit terrifies them and reveals her demonic power.
After a robbery goes wrong, teenagers Thum and Bas flee from police and find themselves in Dan Sai, a small town in Loei province where the locals are celebrating the masked procession Phi Ta Khon. It's a time when spirits are free to walk amongst the living.