Oona Kelly Webster is an editor at a prestigious New York publishing house. Married with two children, her twenty-five-year relationship falls apart when she books a silver wedding anniversary getaway at a luxurious château in France and her husband Charles suddenly drops a bombshell which will shatter her carefully built world.

Although devastated, Oona decides to travel to France without Charles, but soon after her arrival in the charming village of Milly-la-Forêt, the world comes to a standstill due to a terrifying pandemic and all travel is forbidden. Isolated and fearful, Oona then receives another shock when she discovers her job has been made redundant. The only thing which helps her to face the tragedy taking place across the world is that she can remain in France, where the beautiful surroundings and slower pace of life will slowly begin to heal her.