In this installment, the Airplane Boys—Ted and Bob—take to the skies and find themselves on a thrilling adventure in Cuzco, Peru, the ancient capital of the Inca Empire. The boys are drawn to Cuzco by rumors of hidden treasures and long-lost secrets from the Inca civilization. Their journey is filled with excitement and danger as they face treacherous landscapes, mysterious ruins, and villains who are also after the treasures of the Inca.As the boys navigate the challenges of flying in the Andes and exploring the ancient ruins of Cuzco, they use their bravery, resourcefulness, and knowledge of aviation to uncover secrets that have been buried for centuries. Along the way, they encounter local customs, explore ancient Inca history, and become entangled in a race to find the legendary treasures before the antagonists.