Booker Prize-winning novelist Penelope Lively's latest novel opens with a snapshot: Kath, before her death, at an unknown gathering, holding hands with a man who is not her husband. The photograph is in an envelope marked "DON'T OPEN - DESTROY." But Kath's husband does not heed the warning, embarking on a journey of discovery that reveals a tight web of secrets: within marriages, between sisters, and at the heart of an affair. Kath, with her mesmerizing looks and casual ways, moves like a ghost through the memories of everyone who knew her - and a portrait emerges of a woman whose life cannot be understood without plumbing the emotional depths of the people she touched.