In 1956, Ava Lark rents a house with her twelve-year-old son, Lewis, in a desirable Boston suburb. Ava is beautiful, divorced, Jewish, and a working mom. She finds her neighbors less than welcoming. Lewis yearns for his absent father, befriending the only other fatherless kids: Jimmy and Rose. One afternoon, Jimmy goes missing. The neighborhood -- in the throes of Cold War paranoia -- seizes the opportunity to further ostracize Ava and her son.