Dan Fesperman - A kód neve: Helen

West Berlin, 1979. 23-year-old Helen Abell supervises the CIA's commissary houses, where agents and informants can meet without fear in the dangerous city in the middle of the Cold War. One night, however, two mysterious agents appear in one of these houses, conversing in a code language. Helen sets out to find out what they might have been talking about, and in the process of researching, she witnesses an aggressive interaction between a female spy and a high-ranking and dangerous CIA agent. He steps in to save her, but ends up right in the middle of the man's target and has to flee. His decades-long journey is fueled by only one thing: he must solve the case, at any cost. Then in 2014, in Maryland, they find a dead couple. Helen and her husband are. Who was the killer? According to the news, he is none other than the couple's son, but the boy's sister, Anna, begins to investigate their mother's past and soon realizes that everything is much more complex than it seems at first...