As Abbie and David go through their father's effects after his death they discover a memoir he was writing about a love affair he had with a Japanese woman when he was a young surgeon in Japan during the Korean War. They find a picture of the woman, and a letter from the time that suggests they may have a sibling they never knew existed. Even as they mourn their father, David and Abbie question what they thought they knew about his life—and theirs—as they struggle with conflicting memories, unexpected emotions, and new possibilities.