Synopsis: When the immoral Peter Willems (Howard) is accused of stealing in his position at a Dutch East Indies port, he persuades the man who gave him his start in life, the merchant ship captain Lingard (Richardson), to take him up-river to a secret trading post on a remote Indonesian island. There, he falls in love with the beautiful native woman Aissa (Kerima), as the cunning Babalatchi (Coulouris) tries to trick and blackmail him into disclosing the entrance of the secret trading route