The Ragged Edge of Night by Olivia Hawker

It is the final years of WW11, and Anton, forced to give up his friars frock, retreats to a small village outside of Stuttgart to atone for a past wrong.  He has answered an ad from a widow left with three children who is looking for a man to care for all of them in wartime.  Elizabeth is clear that she is not interested in another husband although they must be married for proprieties sake.  Anton sees caring for this one family as a way to assuage his guilt.  He long ago committed to celibacy so the arrangement works just fine.  But the evil that is Nazi Germany finds its way to their village and Anton and Elizabeth feel compelled to respond in anyway they can.  Anton risks his life as a messenger for the Red Orchestra resistance.  Elizabeth takes a stand against the man in the village assigned to guarantee the village loyalty to Hitler.  As their involvement becomes more and more complicated, I was prepared to hate the probable ending.  But this is a real story - part of the author's family history - so the ending was brave and good and right after all.