A crime thrillerRome, the eternal city, is the setting for this show. It’s also the city where the action in “Tosca” unfolds, a thriller ith all the elements of a genre film. To unveil what these elements are, Ramon Gener seeks out the help of students from the Rome Film School, exchanges confidences with American soprano Sondra Rodvanosky and interviews tenor Ambroggio Maestri, as well as Rosella Vodret, a historian who is an…