“Let me fill you in real quick-like,” Doolittle tells Lemuel. “ ‘N.S.A.’ stands for the United States National Security Agency, which is in the business of cryptoanalysis and traffic analysis. TROD’ is short for the Office of Production, which is in the business of signal intercept. A.D.V.A., which I happen to run, is so secret I can’t tell you what the initials stand for. We’re in the business of taking the intercepts provided by PROD and breaking Russian-language cipher systems.”
With an effort Mitchell twists in his seat again. “I pulled down a C-minus in my college math survey course,” he tells Lemuel. “What you do for a living is Greek to me. Doolittle here informs me that you do it better than anyone else in the world. What we want
