 The frescoes on the curved side of the apse show Susanna being threatened by Maximian, but defended by the angel of God, and to the right, Susanna refusing to worship the idol Jupiter.Nebbia's frescoes on the dome of the apse depict Susanna flanked on either side by angels with musical instruments.Behind the high altar, the painting depicting the beheading of Saint Susanna is by Tommaso Laureti.