You probably already know it, but I can recommend the 2006 German movie, 'Sophie Scholl - The Final Days', which details the tragic failure of the White Rose movement. Julia Jentsch gives a sympathetic and convincing portrayal of the lead character. Here is a review by Roger Ebert:-{From Episode 17}
The second fascinating possibility that occurs to me now that 'Barb Moore' seems to be Varvara Mohr, is that one Robert Mohr was a well-known officer in the Gestapo, best known for his interrogation, identification of the leaders of the "White Rose" in 1943. The White Rose was a group of young German intellectuals who opposed the Nazis, risking their lives to print and distribute leaflets about the horrors of the Nazi regime. Sadly, as with the July 20 plotters of the following year, most of the activists were tried and executed. Their heroic story deserves to be re-told, just as the film "Valkyrie" re-told the story of the July 20 plot. War and Remembrance, after all.
https://en.wikipedia.org/wiki/Robert_Mohr
https://en.wikipedia.org/wiki/White_Rose
It's very likely that 'Varvara Mohr' has no connection whatever to either of the semi-famous Mohrs of the Hitler era, but who knows?
Regardless of whether they are or not, the layers of intrigue in "Berlin Diary" are commendable.
http://www.rogerebert.com/reviews/sophie-scholl-the-final-days-2006