The House on Carroll Street (1988)

"Emily Crane left her home one morning and stepped into a nightmare."

A reporter, fired after refusing to give names to a 1951 House Un-American Activities Committee, takes a part-time job as companion to an old lady. While working she overhears a noisy argument in the neighboring house, being conducted largely in German and involving her HUAC prosecutor. She begins to investigate, enlisting the help of the FBI Agent initially detailed to surveil her.