“I am Eva Delectorskaya,” Sally Gilmartin announces, and so on a warm summer afternoon in 1976 her daughter, Ruth, learns that everything she ever knew about her mother was a carefully constructed lie. Sally Gilmartin is a respectable English widow living in picturesque Cotswold village; Eva Delectorskaya was a rigorously trained World War II spy, a woman who carried fake passports and retreated to secret safe houses, a woman taught to lie and deceive, and above all, to never trust anyone.