Giacomo Puccini's opera 'Tosca' might be described as a thriller with political overtones. Set in Rome in 1800 at a time when the Police Chief Scarpia is conducting a reign of terror, it shows its hero and heroine, the singer Floria Tosca and the painter Mario Cavaradossi, caught up in and eventually destroyed by the operations of Scarpia's corrupt regime.
The duet 'Ed io venivo a lui tutta dogliosa' is sung at the end of the first act by Tosca and Scarpia.