An Opera with two acts. the Passenger is a 1968 opera by Mieczysław Weinberg. It is based on the 1959 Polish radio play "Passenger from Cabin Number 45". In this act n the Walter and Liese are still unsure as to whether the mystery woman is really Marta. They try to resolve this issue and Liese faces more and more flashbacks from her years in Auschwirz..