A group of university students go in search of a missing friend in the jungle where they meet a giant snake. With no way out, they must face the beast and fight for their lives.

In the 1960s, there were few places on Earth as quiet and peaceful as Thailand's Chumporn province, This tranquility is shattered the day an unknown dead man's body is found along the banks of the river waterway. Soon after, villagers began to mysteriously disappear for no reason.