ACT I

Cesare Angelotti, a Consul of the former Roman Republic, has escaped prison and seeks refuge in the Church of Sant’Andrea della Valle. The painter Mario Cavaradossi, a Republican sympathizer working in the church, promises to help him. Angelotti hides as Cavaradossi’s lover Floria Tosca arrives. The lovers’ meeting reveals Tosca’s passionate love and jealousy. When Tosca has gone, Cavaradossi instructs Angelotti to dress in the disguise left for him, and hide at Cavaradossi’s villa. Baron Scarpia arrives at the church. He suspects Cavaradossi of hiding Angelotti. When Tosca returns, Scarpia uses a fan left by Angelotti to make her believe that Cavaradossi is having an affair. Tosca leaves for Cavaradossi’s villa, and Scarpia instructs his assistant Spoletta to follow her and track down Angelotti.

INTERVAL

ACT II

Scarpia has arrested Cavaradossi. He summons Tosca to his apartment, and forces her to listen as Cavaradossi is tortured in the next room. Tosca reveals Angelotti’s hiding place. Scarpia condemns Cavaradossi to death but tells Tosca that he will free her lover if she will offer herself to him. In agony, Tosca agrees and Scarpia tells her he will arrange a mock execution. As Scarpia embraces Tosca, she fatally stabs him.

INTERVAL

ACT III

As dawn approaches, Cavaradossi waits for his execution at the top of the Castel Sant’Angelo. Tosca arrives and tells him what she has done. She instructs him on how to pretend to die in the mock execution. When the soldiers shoot, Tosca is impressed with her lover’s acting. But Scarpia has double-crossed her and Cavaradossi really is dead. As Spoletta’s men arrive to arrest her for Scarpia’s murder, she leaps from the battlements to her death.