It is a winter morning in Venice, in 1622. Muted voices drift through a thin wall next door. Her curiosity aroused, a young woman peers through a crack in the door, only to witness a strange and disturbing sight: a woman and a priest secretly celebrating communion. Troubled by what she sees, she reports the incident at confession. Her revelation leads to the arrest, jailing, and arraignment of the two for heresy before the Venetian Holy Office of...