A film inspired by terrifying true events. When the tenants are members of a dark cult, they terrorize the homeowner, looking for their next prey to sacrifice.

In December 2004, close-knit family Maria, Henry and their three sons begin their winter vacation in Thailand. But the day after Christmas, the idyllic holiday turns into an incomprehensible nightmare when a terrifying roar rises from the depths of the sea, followed by a wall of black water that devours everything in its path. Though Maria and her family face their darkest hour, unexpected displays of kindness and courage ameliorate their terror.

The story is set in 1890s Siam. Siang is a young Muay Thai warrior and rocketry expert who steals back water buffalo taken from poor Isan farmers by unscrupulous cattle raiders. He is searching for a man with a tattoo who killed his parents.

After losing his job, his car and his money, Phuchit, races against time to complete 13 tasks ordered by an anonymous caller who promised 100 million Baht upon completion.