Totally frivolous, but …
When Ingrid asks Daniel to meet her in Wannsee:
It makes me think of this song:
Evil, evil earworm. Of course, there’s that other association with Wannsee. Not sure where they will be, as there is no Wertheimer Str. in Wannsee. Though the name Wertheim naturally raises its own series of Berlin associations. That’s the thing about Germany in general and Berlin in particular — so many historical associations everywhere. Dizzying.