The Moment By Douglas Kennedy
This is the storyof a divorced American writer living a very private life in Maine. One winter morning his solitude is disrupted by the arrival of a package postmarked "Berlin". It brings back memories of a former lover and their relationship in a divided Berlin where people lived fearfully under the shadows of the Cold War. She was a refugee from the police state of East Germany and they met through their work.
I found it very different from my usual reading and initially it was riveting but, halfway through, I got a bit confused and found the story hard to follow. It was described as a love story but was also a bit of a thriller.