Graham and Annie have been married for nearly thirty years. Their seemingly effortless devotion has long been the envy of their circle of friends and acquaintances. By all appearances, they are a golden couple. Graham is a bookseller, a big, gregarious man with large appetites - curious, eager to please, a lover of life, and the convivial host of frequent, lively parties at his and Annie's comfortable house in Cambridge. Annie, more reserved and introspective, is a photographer. She is about to have her first gallery show after a six-year lull and is worried that the best years of her career may be behind her. They have two adult children: Lucas, Graham's son wife his first wife, Frieda, who works in New York. Annie and Graham's daughter, Sarah, lives in San Francisco. Though Frieda is an integral part of this far-flung, loving family, Annie feels confident in the knowledge that she is Graham's last and greatest love. When Graham suddenly dies - this man whose enormous presence has seemed to dominate their lives together - Annie is lost. What is the point of going on, she wonders, without him? Then, while she is still mourning Graham intensely, Annie discovers a ruinous secret, one that will spiral her into darkness and force her to question whether she ever truly knew the man who loved her.