I believe it is based on Metaxas’ book.
The part of Metaxas’ book that was vey emotional for me is when Maria writes to Bonhoeffer saying, “Today I can say Yes to You.”
It means that, “with that, Dietrich Bonhoeffer was engaged.”*
*quote from the book.
A wartime love story, certainly.
I highly recommend the book.
It is criminal to change the truth to fit one’s idea of History.
I won’t bother with the film.