The military attaché serves one basic purpose: legalized spying. Cloaked, up to a point, by his diplomatic immunity, he goes to cocktail parties, parades and factories, gets local generals plastered (unless they get him plastered first), and ranges through the countryside with notebook, camera and a blank expression.
For reasons unknown, the Russians had permitted four Western military attachés (three American, one British) to ride the Trans-Siberian Railway all the way from Moscow to Khabarovsk, headquarters of the Soviet Far East military command. It was the first time in two years...