Anna was a good wife, mostly ... Anna Benz lives in comfort and affluence with her husband and three young children in Dietlikon, a picture-perfect suburb of Zurich. Anna, an American expat, has chosen this life far from home; but, despite its tranquility and order, inside she is falling apart. Feeling adrift and unable to connect with her husband or his family; with the fellow expatriates who try to befriend her; or even, increasingly, her own thoughts and emotions, Anna attempts to assert her agency in the only way that makes sense to her: by engaging in short-lived but intense sexual affairs. But adultery, too, has its own morality, and when Anna finds herself crossing a line, she will set off a terrible chain of events that ends in unspeakable tragedy. As her life crashes down around her, Anna must then discover where one must go when there is no going back ...