Ben Morris (Garner) is a fashion photographer on assignment with model Alison (Renzi) in South America where they become entangled with eccentric Sammy Ryderbeit (Kennedy) who's searching for a lost diamond mine. Caught up in the adventure, the duo accompany Sammy and find the mine, only to discover Raul Ortega (Ansara) and his band of revolutionaries have gotten there first. Based on the novel "Snake Water" by Alan Williams.