Given the question: Build a movie plot around this: What is Mascha's role? spy
The answer is:
In Czechoslovakia on June 4, 1942 during the Nazi occupation of World War 2 the vicious Nazi Gestapo leader Reinhard Heydrich, known as The Hangman, is shot at a public location and the man responsible, Dr. Franz Svoboda (Brian Donlevy) has lost his escape because his driver has been arrested. Forced to move about the streets he runs out of options when martial law is announced and a curfew threatens his capture. Svoboda follows Mascha Novotny (Anna Lee) home from the market and posing as a social aquaintance manages to stay the night since the curfew has prevented his departure. Mascha's father Prof. Stephan Novotny (Walter Brennan), consistently suspected because of his anti-Nazi views, is taken into custody and Svoboda escapes disguised as a student. At the internment camp the group of Czech prisoners including Prof. Novotny are systematically assassinated and Mascha is taken into custody for questioning about the possible identity of the man who shot Heydrich and she works with the Czech counter-group to overthrow spies for the Nazi in hopes that she can save her father. One spy they discover in their midst is Emil Czaka (Gene Lockhart) a wealthy beer brewer who names 400 Czech citizens to be taken into custody and shot as a way to get to Svoboda, and during a complex plan they attempt to overthrow the Nazi grip on the Czech nation and save the prisoners.