Sur la Côte d’Azur, Kistna et sa bande de malfaiteurs cherchent à subtiliser à Jacques d’Athys un mystérieux document. Leur plan consiste à enlever Tih-Minh, une belle Indochinoise fiancée à Jacques. Celle-ci est libérée mais le traumatisme lui fait perdre mémoire et parole.
Jacques Chauvry, the new government delegate for a French protectorate in Cambodia, meets the young Soun who, due to a series of circumstances, will become heir to land that houses a large oil field. Tao , an evil mestizo, along with his minions, tries to get hold of these lands, terrorizing the locals by appearing disguised as the "spirit of evil".