It combines elements of American culture and Old-time radio with themes of lost cities, jungle exploration and shamanism.

When the skull turns up on his doorstep, he knows he's once again going to be travelling deep into the Amazon Rainforest to find that legendary Lost City – which even now seems more like a dream than a reality.

Once again the sinister crook, Paulo Pompadora, seems to be at the heart of things and dodging him is just one of the problems Jack has to face as he plans his expedition up crocodile infested waters, through caves full of vampire bats and on to a city that may be one of the world's last magical places that needs visitors as much as it needs treasure-hunters with arms full of dynamite.

There is a strong ecological theme running through the story illustrating man's greed leading to the destruction not only of fragile ecosystems but also to the special, magical places in the world.

Additional ideas plucked from the mind of Marcia Dale Lopez Sounds recorded in Rio, the Amazon, and the Pantanal of Mato Grosso by Fulton & Clark "Production was made possible through grants from the National Endowment for the Arts, and donations from people like you, maybe even you.