His objective this dripping winter noon is a gray stone town house, neither large nor historic enough to figure in any guidebook, set back just out of sight of Grosvenor Square, somewhat off the official war-routes and corridors about the capital. When the typewriters happen to pause (8:20 and other mythical hours), and there are no flights of American bombers in the sky, and the motor traffic's not too heavy in Oxford Street, you can hear winter birds cheeping outside, busy at the feeders the girls have put up.