In 1950, five years after the Second World War, the Cold War is at its height.
Katya is a spy who works for the United States, to which they assign what is perhaps the most important and complicated mission of her career.
You will have to approach Alexander, one of the youngest promises of the Russian government to obtain from him all the information he can.
Without realizing it, Katya ends up falling in love with him, something she can not afford, although sometimes love is stronger even than duty.
Thus, Katya will do something that will become a huge sacrifice for her, especially considering that she completely rejects communism, an ideology of which Alexander is one of the greatest exponents.
Alexander does not know anything, but he finds out about everything that happened thirty years later, when he will understand many of the things that happened with Katya in those years.