The Consul had been quick and his telex had finished up on Charles Mawby's desk.

The German name and the Soviet background had nagged at Mawby, caused him to take the lift to the Library in Century House, caused him to smile sweetly at the wide- hipped ladies who could drop their hands on cross references, caused him an agreeable sting of pleasure when they reported back that the junior interpreter was the son of Doctor Otto Guttmann. Mawby had glanced once at the files the ladies showed him and with rare excitement hurried to telephone the Consul.

He brushed the crumbs from the biography sheet, wondered why his wife needed the television's volume so high and glanced again at the typed detail.

Lizzie Forsyth's little indiscretion, her failure to get herself kitted up, had landed in their laps the son of the Director of Russian anti-tank missile research. There would be some pieces for the jigsaw out of that, could hardly be otherwise.

Sweet, wasn't it? And the Deputy-Under-Secretary had already offered his congratulations, and there would be something to go to the market place with, barter for the friends across the water, and you needed something strong to wring material in exchange out of Washington.

That evening Charles Mawby immersed himself in the technology of weapons code named Snapper, Swatter and Sagger that could destroy a NATO Main Battle Tank at a range of two thousand metres, and read the evaluations of the potential of its untried successor. He buried his mind in blueprint studies that showed skeleton mechanisms with appended titles for Hollow Charge Warhead, and Gyroscopic Controller, and Guidance Wire Spool. He assimilated a paper on the theory of the tactics that the Warsaw Pact would employ with infantry operated anti-tank-war- heads to halt a NATO armoured counter-thrust.