Joshua arrives on a tropical island to launch his resort, Paradise House, ignoring the warnings of his assistant, Alice Brandt, regarding the local Kuma tribe. When promotional model Sheena vanishes during a river excursion, Daniel Nessel and Alice investigate, discovering that a vengeful river god, Kruna, has been unleashed by the desecration of the land. After an encounter with a survivor named Prophet Jameson, they realize the creature is an unstoppable force of retribution. As the resort opens, chaos erupts when Kruna slaughters guests while the Kuma warriors launch a brutal raid, forcing a desperate struggle for survival amidst the destruction of the island oasis.