Information for Tosca at Oxford Playhouse, Oxford (Opera or Operetta). It is the eve of the Battle of Marengo. Napoleon's army has caused chaos and disarray throughout all Italy. Against this background of political turmoil stands Floria Tosca, Rome's famous and most beautiful opera singer. To save her lover, Cavaradossi, she must sacrifice her virtue to the evil Baron Scarpia. Can the power of love and honour ever prevail against the forces of corruption and betrayal? Tosca is a moving and passionate exploration of personal freedom, the cost of ideals and the choices forced on us by love.