It is 1940 and half the world is living through the horror of the Second World War, but America still believes it is safe from the bloodshed.
In Franklin, a small town on Cape Cod, Iris James is the postmistress and she firmly believes that her job is to keep and deliver people’s secrets, to pass along the news of love and sorrow that letters carry. But one day she does the unthinkable: she doesn’t deliver a letter and instead slips it into her pocket.