The explorers are caught in the middle of a war between Tribue, with gunpowder in toe, and Drakul and his barbaric raiders. One of them will be lost, possibly forever, when this battle reaches its cliffhanger.
The plateau is threatened with destruction as the explorers encounter a baffling new phenomenon. We are left with a cliffhanger that ends the series and never returns.
An explosion traps Marguerite and Roxton in an underground chamber, and their only hope for escape is Challenger...but the same explosion has left him with no memory of who he is or what has happened to his friends.
Roxton's wartime record is exposed by a stranded enemy agent, who has also been trapped on the plateau. Plus some other secrets about Marguerite and Challenger come to light.
Roxton, Malone and Challenger help an Amazon woman attacked by a Raptor. Challenger gets injured and the Amazon tribe repay the adventurer by healing him, but have other things in mind for the men.
The aged guide who brought Veronica's parents to the Lost World dies in Challenger and Veronica's arms, humming "Ode to Joy," leading the explorers to seek out a hidden paradise, where Veronica suspects her parents might be.
