The Photograph by Penelope Lively

I liked this book much more than I thought I would from the description of it.  A man, Glyn, finds a photograph of his late wife, Kath, holding hands with her sister's husband.  Glyn becomes obsessed with trying to find out whether Kath had had other affairs.  The story is told from several different characters' points of view.  It is about relationships and listening and whether it is possible to really know another person.  I rate this book 4 out of 5.