A unique combination of children''s literature and travel book, in which, indirectly, through the plot and the heroes'' adventures, the sites and monuments of each region are presented, as well as elements of the history, geography, and culture of the place. Professor explorer Iguana Jones is a real person, even more real than the author of this book. With his inseparable iguana Montezuma, a group of four children, and the invisible reader, they undertake the most dangerous missions. An unexpected adventure awaits the secret group in Athens. Will they be able, with the help of the magic map, to take Theseus'' ring from the apprentice antiquities thieves and return it to the museum? The Black Scarab and the Pink Dragonfly have a different opinion.