Marlow, the story's narrator, tells his friends of an experience in the British Congo where he once ran a river steamer for a trading company. He tells of the ivory traders' cruel exploitation of the natives there. Chief among these is a greedy and treacherous European named Kurtz, a man who has used savagery to obtain semi-divine power over the natives. While Marlow tries to get Kurtz back down the river, Kurtz tries to justify his actions and motions,...

Reluctantly accompanying her advocate mother to a bonobo sanctuary, a teen girl participates in a desperate effort to rescue the bonobos and survive in the jungle when a revolution breaks out and the sanctuary is attacked.