Steven Hatfill and I were sitting near a balcony overlooking a hangar of bomber jets arranged by war. We had wandered for hours across the vast aerospace gallery of the Udvar-Hazy Center in Chantilly, Virginia. Hatfill—doctor, ex-Army private, ex-expatriate—relished the chance to kill time among these engineering marvels, and the place seemed to activate his inner gearhead. After co-piloting a Wright brothers’ flight simulator and exhausting the museum’s exhibits, we moved upstairs for lunch. Leaning back in his chair, Hatfill pulled out a tin of Copenhagen tobacco and packed his lip. We got to talking…
