A quick moving figure, accompanied by triplets, announces Tosca's entrance, and she thinks that she has heard her lover conversing with another woman, and even declares she heard the swish of skirts. Cavaradossi attempts to embrace her, but she reproves him, and first makes an offering before the Virgin's shrine. This done, she tells him that although she is singing at the theatre that evening, the piece is a short one, and proceeds to sing in a delightfully suave melody, which increases gradually in intensity, of the delights of love in a quiet secluded cottage far away from all worldly distractions. Cavaradossi comes in at the close with an impassioned burst on a characteristic high note, in which he says that he is caught in the toils of her enchantment. The artist makes as his excuse for her quick dismissal the need of continuing his work on the picture, but his frequent glances towards the chapel show that his anxiety for his friend is the cause of his agitation. But Tosca now comes in sight of the picture, and is struck by the resemblance of the face to some one she has seen. She immediately connects the whispering she has heard before arriving upon the scene and the anxious looks towards the chapel together as a proof that Cavaradossi has been meeting the original of the picture. The incident, however, leads up to a further avowal of devotion on the part of Cavaradossi, and their voices blend together for a brief space in a delicious bit of melody. Tosca elects to be comforted, and with a final thrust she goes out, requesting her lover to change the lady's eyes to black ones. Angelotti now comes out of the chapel and tells of his plan of escape. Cavaradossi gives him the key of his villa, and indicates the way he may reach it. Angelotti takes up the bundle of clothes left by his sister for his disguise--the sister being the lady who has been frequenting the church of late, and who has attracted the artist's attention--and goes off, while his friend tells him, as a final precaution in case of urgent need, of a passage that leads down to a cellar. Just as Angelotti is going the cannon sound from the fortress, giving the signal that the prisoner's escape has been discovered.