Act 2
The Tsar's private apartments in the Kremlin, (Even in his children's nursery Boris finds little respite from conspiracy without and a guilty conscience within) Act 3
The castle of Sandomir in Poland
Scene 1: The dressing-room of Marina Mnishek. (Upon the ambition and superstition of Marina the Jesuit Rangoni plays to some purpose)
Scene 2: The fountain terrace. (Grigory, now the pretender imitry, adores Marina; and in his plot to claim the throne of Boris, becomes the Jesuit's tool for the conversion of Russia)