By Nightfall : The whole course of one's life really can change in an instant. Peter is forty-four, prosperous, childless, the owner of a big New York apartment, a player in the NY contemporary art dealing scene. He has been married to Rebecca for close on twenty years. Their marriage is sound, in the way marriages are. Peter might even describe himself to be happy. But when Mizzy, Rebecca's much younger brother, comes to stay, his world is turned upside down. Returning to their New York flat after work one day, Peter sees the outline of Rebecca in the shower. But when he opens the shower door, it is Mizzy he comes face to face with. From that moment on, Mizzy occupies all of Peter's thoughts.