Result - Prague
Which 2002 play by Neil LaBute that takes place around 11 September 2001 concerns an extra-marital affair between a man (Sam) and his boss (Abby) who worked in the World Trade Centre?
It started as a play in Germany in 1897 by Oscar Blumenthal and actor Gustav Kadelburg, was recreated as a silent film in 1926 and then as a musical in 1930 as which it has remained popular. What is the title?