- 1900 - Verismo Cesare Angelotti, an escaped political prisoner, rushes into the church of Sant' Andrea della Valle to hide in the Attavanti chapel. As he vanishes, an old Sacristan shuffles in, praying at the sound of the Angelus. Mario Cavaradossi enters to work on his portrait of Mary Magdalene - inspired by the Marchesa Attavanti (Angelotti's sister), whom he has seen but does not know. Taking out a miniature of the singer Floria Tosca, he compares her raven beauty with that of the blonde Magdalene ("Recondita armonia"). The Sacristan grumbles disapproval and leaves. Angelotti ventures out and is recognized by his friend and fellow liberal Mario, who gives him food and hurries him back into the chapel as Tosca is heard calling outside. Forever suspicious, she jealously questions him, then prays, and reminds him of their rendezvous that evening at his villa ("Non la sospiri la nostra casetta?"). Suddenly recognizing the Marchesa Attavanti in the painting, she explodes with renewed suspicions, but he reassures her ("Qual' occhio al mondo"). When she has gone, Mario summons Angelotti from the chapel; a cannon signals that the police have discovered the escape, so the two flee to Mario's villa. Meanwhile, the Sacristan returns with choirboys who are to sing in a Te Deum that day. Their excitement is silenced by the entrance of Baron Scarpia, chief of the secret police, in search of Angelotti. When Tosca comes back to her lover, Scarpia shows her a fan with the Attavanti crest, which he has just found. Thinking Mario faithless, Tosca tearfully vows vengeance and leaves as the church fills with worshipers. Scarpia, sending his men to follow her to Angelotti, schemes to get the diva in his power ("Va, Tosca!").