There are small historical mistakes that are annoying especially giving the hype about the book's supposed superior research
For once, no young girl living in Sachsen Anhalt in 1976 would have been able to move to Kreuzberg West Berlin, there was a Wall in between.
Zoo Station is not the nearest train station to Clay Allee, Wannsee is.
Tempelhof was the US Airforce base in1979.
But besides all that, what exactly is Helen's quest? Her irrational and emotional actions endangered Frieda. I understand she feels upset and responsible, but what does she hope to achieve?
If Robert is really such a darkarts star, the agency will not care about his sexual assault proclivities, especially not in 1979. Priorities!!! How naive she acts throughout the book. Annoying.
She jeopardizes careers and the lives of others as well as herself, and for what? Robert will never be prosecuted for attempting rape, he knows too much and there is no evidence. So what does Helen hope to gain?
Emotional righteousness is silly and out of place when fighting a cold war against the main enemy.
That is the most annoying thing in the book, that the author keeps saying that the cold war was as good as over in 1979. Really??? It Wasn't so over for those who lived there or served to defend West Berlin.