A recent law graduate accepts the invitation of his friend, he travels to Rome, where he is introduced to the 'Project Erika' a military science laboratory. The project with its technological equipment offers the opportunity to help law enforcement to solve crimes. It also has an experimental field that allows you to see a person's past. The young lawyer sees some episodes of his childhood, then incidentally sees episodes of more than two hundred years before. He was a nobleman and fell in love with a poor girl. Thanks to his friend Pier, they train the girl in good manners, finally, she is presented with a fakenoble origin and manages to get married. The revolution French begins, the wife fears something sinister and communicates it to her husband. He makes a promise to her, saying that if there was another life, he would come back and look for her. He is captured and beheaded. Back in Rome, present time, in the laboratory, he wonders what is right to do, and decides to go and look for the woman he had loved several years earlier to keep his promise.