Keller is your basic urban Lonely Guy. He makes a decent wage, lives in a nice apartment.Works the crossword puzzle. Watches a little TV. Until the phone rings and he packs a suitcase, gets on a plane, flies halfway across the country…and kills somebody. Keller’s unlikely pastime is stamp collecting, to which he is nearly obsessively devoted. (He collects non-U.S. issues, prior to 1940.)