After having proposed to Esteban that they join forces to find the fifth city of gold, the deceitful Gomez sends his men to capture our heroes. But only Mendoza and Esteban fall into their hands. So the others are able to execute their plan to help free the captives at Kilwa threatened with being sold into slavery. Finally, Mendoza fights Gomez in a duel while Esteban steals the map leading to the city of gold. Meanwhile, Ambrosius heads for a secret base where a surprising welcoming committee awaits him...
