SYNOPSIS
The Church of SantґAndrea della Valle, Rome 
Angelotti, former Consul of the Republic of Rome and now a political  prisoner who has escaped from prison, enters exhausted. He hides in the chapel  of his sister, the Marchesa Attavani. The artist Cavaradossi is working on an  image of Mary Magdalene. The Sacristan is shocked that the painting resembles a  woman in his congregation. Cavaradossi denies the resemblance: only Tosca  occupies his thoughts and his brush could paint the features of no-one else.  After the Sacristan leaves Angelotti emerges from the chapel. He knows the  artist and trusts him, and so he begs for assistance. Hearing Toscaґs voice, he  hides again. The singer notices the painting of Mary Magdalene resembles the  Marchesa Attavani. Toscaґs jealousy erupts but the artist manages to pacify her.  Floria leaves and Cavaradossi offers the fugitive refuge in his home. Gunshots  are heard - the escape has been discovered. The men hurry away. 
A  celebratory mass begins. Scarpia, chief of police of Rome, and police agent  Spoletta are among the worshippers. They are interested in the Attavani Chapel  where they expect to discover Angelotti, but find a fan left there by the  Marchesa and an empty food basket. Seeing Tosca return to the church in the  hopes of seeing her beloved again, Scarpia decides to seize his opportunity. He  cunningly provokes Floriaґs jealousy. When she runs out of the church, Scarpia  sends police agents after her, believing that the infuriated Tosca will lead  them to the artistґs secret hiding place.
The Farnese Palace 
Scarpia is in his apartments  awaiting news from his agents. His expectations are only half fulfilled: Tosca  did lead them to Cavaradossi who has now been arrested but Angelotti remains at  liberty. Scarpia hopes to torture the artist into revealing the truth and orders  Tosca be brought to him. The chief of police himself begins Cavaradossiґs  interrogation but to no avail. The artist manages to whisper to Tosca to keep  the secret at all cost. He is led off to be tortured. His groans and screams  make Floria lose her self-control and she reveals the secret hiding place in the  garden. Scarpia orders an end to the torture. In agony, Cavaradossi is thrown at  Toscaґs feet by the soldiers. He hears the chief of police and understands that  the secret has been revealed. He curses Tosca. Scarpia orders that he be taken  away and executed in the morning. In answer to Toscaґs pleas, he says he will  spare Cavaradossiґs life if she will be his. In Toscaґs presence the chief of  police gives an ambiguous command and issues a pass for her and Cavaradossi,  allowing them to leave Rome. Tosca, however, does not realise that the execution  will be real. Scarpia runs towards Tosca and, defending herself, she kills him.  Staring at the corpse in horror, she carefully removes the pass from Scarpiaґs  hand and slips out of the palace.
The platform of the Castel  SantґAngelo Cavaradossiґs execution is to take place here. Overwrought,  Tosca rushes in and explains it is to be a mock execution. Mario has to play his  part well so the soldiers suspect nothing, and then they can flee the city. The  soldiers appear. They fire and the artist falls to the ground. Floria calls his  name in vain. Realising he is dead, Tosca throws herself from the parapet.