The story:
The Phantom returns to the jungle to learn that the powerful Osi-Wey tribe has declared war on the Llongo after the disappearance of the daughter of the Osi-Wey chief. However, the real perpetrators are two unscrupulous diamond hunters, who also have spread a rumour that the jungle is unprotected after the Phantom's death.

The Phantom must race against time to stop a ferocious jungle war, but must also track down one of the diamond hunters, who returns to the jungle with an unsuspecting Diana to settle the score with his masked nemesis.