Cant remember the Title or Author

I am looking for a story, though all i can remember is that, it is set during WW2, MC is a Military Officer, used as translator by both Germans and allies,

MC, Hides in village house, German/fFrench border???, in wardrobe???

MC, uses the only civilian clothes available, female

MC, road block I think, taken in by Germans, gives french mothers maiden name and place of birth, as is multi lingual, German, French and English

MC, builds relationship with German Fighter Pilot???, his brother is in German Navy, and sister, Gretchen I think, is a nurse.

MC, Father is I think a member of the Allied chiefs of staff.

MC, and German emigrate to US after the war, I think the brother stays in Germany as a farmer