"My granddaughter was here. I rang her because my daughter told me that something had happened here. And she didn't answer for two hours."

And he wouldn’t take no for an answer when he offered to help carry equipment to my car.

John Reid, a former Chicago police officer and polygraph expert, and Fred E. Inbau, a criminologist and former director of Northwestern Law School’s Scientific Crime Detection Laboratory, had an answer.

“They are seeking what they believe to be is the right answer, the right outcome, according to their perspectives,” she said.

"The main challenge was to make sure we'd highlight the mosaics and we'd create something that answers to the various needs of the cathedral," he adds.