Zofia Posmysz never will forget the moment.
She was standing in the Place de la Concorde in Paris, in 1959, when she heard a sound that devastated her.
She thought she recognized it from Auschwitz-Birkenau, the Nazi death camp where Posmysz was imprisoned from 1942 to 1945. The sound instantly sent her back to that nightmare.
"There was a huge crowd, lots of tourists, and most of them German," remembers Posmysz, 91, of the incident in Paris that led her to write the story now unfolding on stage at Lyric Opera, "The Passenger."
"I heard a voice," continues Posmysz, "and so this voice sounded identical with the voice of my...