You come from a long line of mistakes, Guy Caulder tells his daughter Alice. My mother married the wrong man. Her mother did the same.
At the end of a love affair, Alice journeys to Normandy to meet Guy's mother, the grandmother she has never known. She tells her granddaughter that, in spite of the troubles her family has faced, there was one true love story in her past.
In the summer of 1942, Kitty is an ATS driver stationed in Sussex. She meets Ed, a Royal Marine commando, and Larry, a liaison officer with Combined Operations under the command of Louis Mountbatten. Kitty falls instantly in love with Ed, who falls in love with her. So does Larry.
Mountbatten mounts a seaborne raid on the beaches of German-occupied Dieppe in northern France. One of the worst disasters of the war, it has a profound effect on both Larry and Ed, and its repercussions will echo through the generations to come.