Professor Dal Colle finds a mysterious fresco in a church and then discovers a disturbing truth that dates back to the times of the Inquisition. He then decides to give an interview to a young journalist but mysteriously disappears before he can talk to him. Eager to complete his piece and intrigued by what Dal Colle would reveal to him, the journalist begins to investigate what happened, bringing to the fore a disconcerting reality about the inhabitants of a small Friulian village.