The building itself was unprepossessive enough. It was an old-fashioned, six-floor, brick structure that had, over the years, served first as a private home, then as an apartment building, and finally as the headquarters for the organization it presently housed. It stood among others of its kind in a lower-middle-class district of Arlington, Virginia, within howitzer range of the capitol of the United States, and even closer to the Pentagon. The main door was five steps up from the sidewalk, and