Puccini portrays the idealism of Tosca and her lover Mario Cavaradossi through radiant, expansive music, including Act I's duet 'Qual occhio al mondo', Cavaradossi's ardent aria 'Recondita armonia' and Tosca's despairing Act II prayer 'Vissi d'arte'. Baron Scarpia's music, by contrast, is dark and terrifying – from the demonic chords that open the opera to the violence of his Act II exchanges with Tosca. Jonathan Kent's production, with Paul Brown's stunning designs, perfectly evokes the troubled atmosphere of Rome in 1800 and Tosca's combination of sensuality and religious sincerity.
Rome in 1800 is in political chaos. Cesare Angelotti, a former consul of the short-lived Roman Republic, has escaped imprisonment, and seeks refuge in the church of Sant'Andrea della Valle. The painter and republican sympathizer Mario Cavaradossi promises to hide him at his country villa. Baron Scarpia, Rome's tyrannical Chief of Police, suspects that Cavaradossi has helped Angelotti to escape. He persuades the painter's opera singer lover Floria Tosca, whom he himself desires, that Cavaradossi has betrayed her. She leaves to confront Cavaradossi at his villa and Scarpia orders his men to follow her, in the hope they'll find Angelotti.
Scarpia arrests Cavaradossi, and tortures him in Tosca's presence until she reveals Angelotti's hiding place. Scarpia subsequently condemns Cavaradossi to death. Alone with Tosca, Scarpia tells her that he will save Cavaradossi - but only if Tosca spends the night with him. Will Tosca yield to the man she hates to save the man she loves?