Victor Appleton 
Tom Swift in the City of Gold, or, Marveleous Adventures Underground [EPUB ebook] 

Tom Swift in the City of Gold is a book in the "Tom Swift" series by Victor Appleton. The story follows Tom Swift as he sets out on a quest to find the city of gold deep in the jungles of South America. With the help of his friends, Tom braves dangerous obstacles and battles fierce enemies as he journeys underground to uncover the hidden riches of the legendary city. Along the way, Tom must use his wits and resourcefulness to survive in a world of treacherous caves, unstable earthquakes, and ancient traps. Will Tom succeed in finding the city of gold, or will he be thwarted by the dangers that lurk within?