San Francisco, 1975. A single mother, Lux Lysander is overwhelmed, underpaid, and living on the edge of an emotional precipice. When her adored five-year-old son is away visiting his grandparents, Lux takes a solo trip to Sonoma Valley--a chance to both lose herself and find herself again. Awakened at midnight, Lux steps outside to see a fog settled over the Sonoma landscape. Wandering toward a point of light in the distance, she emerges into a meadow on a sunny day. There she meets a group of people whose sweetly simple clothing, speech, and manners almost make them feel like they are from another time. And then she realizes they are. Lux has stumbled upon an idyllic community cut off not only from the rest of the world but from time itself. The residents of Greengage tell a stunned and disoriented Lux that they've somehow been marooned in the early twentieth century. Having inexplicably stepped into the past, it is not long before Lux is drawn in by its peace and beauty. Unlike the people of Greengage, Lux discovers that she is able to come and go. And over the years, Lux finds herself increasingly torn between her two lives. Her beloved son is very much a child of the modern world, but she feels continually pulled back to the only place she has ever truly felt at home.