A unique combination of children's literature and a travel book, where indirectly, through the plot and adventures of the characters, the sights and landmarks of each region are presented, along with elements of the history, geography, and culture of the place. The explorer-professor Iguana Jones is a real person, more real than the author of this book. Together with his inseparable iguana, Montezuma, a group of four children, and the invisible Reader, they take on the most dangerous missions. This time an exciting adventure awaits the secret group in the most beautiful country in the world, Greece. Will they manage to meet the twelve people with black hats and obtain the letters of the secret word that will lead them to the treasure? The gang of antiquities smugglers KOU KOU TZA and the Pink Panther have other plans.