Jack Hersch said it was a tradition every Passover for his father, David, to tell his sons about how he escaped the Nazis.

"He would talk about the death march - put on a 34-mile march, he made it sound like he was going to get a cup of coffee around the corner," Jack Hersch said.

Then a mysterious photo led Jack to wonder if there was more the story — and go in search of answers. 

Watch the full story online