How many reported sightings of a particular ghost would it take before you started to believe that perhaps people were indeed interacting with something supernatural? Hundreds? Over a thousand? But you're looking for proof, you say. Well, what would be convincing proof for you? What about mysterious, spectral handprints melted and scorched into bronze bars that have resisted repair and coverup? Tonight in Part Three of our series, we examine the possibility that Mary may have left her indelible mark not only on the front gates of Resurrection Cemetery but also in the imaginations of Chicagoans ever since.