Shirley Kaszenbowski, nee Silverberg, is a middle-aged, middle-class woman in a Holt Renfrew tweed coat, a basic black dress, and a strand of real pearls. She may seem ordinary enough, pricing silk scarves at Eaton's or idling in hotel coffee shops, but in fact she is searching for her lover. He is an elusive figure, a man connected with "The Agency," a powerful technocrat who may or may not have suggested a rendezvous based on a secret code in the National Geographic. Her search takes...