A prisoner in a state-of-the-art penitentiary begins to question the purpose of the emotion-controlling drugs he's testing for a pharmaceutical genius.

Ray Lorkin, chief lawman in the tiny rural settlement of Wala Wala, Australia, fears that long-simmering tensions between the area's aborigine natives and white settlers are on the verge of erupting. When it's discovered that Kate, the white wife of local schoolteacher Les, has despoiled a sacred site by secretly meeting her aborigine lover, Tony, there, a shocking murder threatens to rip the small town apart.

A mysterious guide escorts an enthusiastic adventurer and his friend into the Amazon jungle, but their journey turns into a terrifying ordeal as the darkest elements of human nature and the deadliest threats of the wild force them to fight for survival.