Ruth GilmartinPlayed by Michelle Dockery
A single mother and graduate student, Ruth has lived her entire life under the mistaken impression that her mother is an ordinary British housewife named Sally. For years, Ruth has enjoyed the laid back bohemian lifestyle of an academic, immersed in writing her graduate thesis and raising her son. She is astonished when her mother suddenly decides to reveal a dark lifelong secret. Ruth not only has to confront the fact that her mother is not the woman she believed her to be—but that someone is trying to kill her. In order to come to her mother’s aid, Ruth must first uncover the full story of her life as spy Eva Delectorskaya. She is quickly drawn into her mother’s hidden world of cloak and dagger as she works to keep her safe.