Traitors (TV series)

Feef Symonds is a young British training to become a spy oversees when the WWII ends and her aspiration of living an exciting life full of purpose ends. She is then approached by her American lover, who is working for the American intelligence. He recruits her to Work fo the Americans as she becomes a civil servant secertary in order to find Russian moles, which they believe infiltrated the British govermemt. Pressure rapidly grows as alliences are tested and she learns that in the spying game you cannot really trust anyone. - IMDb