A forgotten woman... 1951. Esther Durrant, a young mother, is committed to an isolated mental asylum by her husband. Run by a pioneering psychiatrist, the hospital is at first Esther's prison but soon becomes her refuge. A cache of unsent love letters... 2018. When free-spirited marine scientist Rachel Parker is forced to take shelter on a far-flung island off the Cornish Coast during a research posting, she discovers a collection of hidden love letters....

Against the backdrop of post-World War II Australia, Sarah Adams is a nurse who becomes involved in the affairs of the wealthy Bligh family. It is dealing with themes such as anti-Semitism, sexuality, and social class.

In the final season, Sarah Nordmann finally marries wealthy landowner George Bligh. But as Sarah takes her place as lady of Ash Park, George's mother, Elizabeth, feels pushed out of the household. George's son, James, returns from abroad to start a business, while his daughter, Anna, lives in Hawaii with her sister-in-law, hiding a secret from the family. The Bligh's face tragedies, betrayals, and new beginnings that will challenge their relationships...