The altarpiece, which is a copy of a painting by Cristoforo Roncalli (better known as il Pomerancio, 1552-1626), depicts a story from the Acts of the Apostles in which Ananias and Sapphira were punished for withholding money they had promised to the Apostles and for lying to St Peter. Sapphira falls to the ground in front of Peter, while in the background the dead body of her husband is being carried away. The altarpiece is placed directly opposite the Sacristy as a solemn reminder to priests, as they walk out to celebrate mass, of their commitment to truth.