Gianni and Bruno are two students who travel the world, collecting a number of special souvenir statues of the Pisa Leaning Tower. A clue leads them to the location of each statue. Working against them is The Killer, a man dressed all in black, who is collecting the statues himself. When all the statues were placed in the correct order-on a secret panel inside the Leaning Tower-a secret treasure was supposed to be uncovered. In the final episode, the criminals stole all the statues and placed them incorrectly into the secret panel-causing the Tower to launch into outer space.