Читаем Clear and Present Danger полностью

The United States government had been in the business of intercepting foreign radio communications since the days of Yardley's famous Black Chamber. Technically known as comint or sigint - for communications or signals intelligence - there was no better form of information possible than your enemy's own words to his own people. It was a field in which America had excelled for generations. Whole constellations of satellites were deployed to eavesdrop on foreign nations, catching snippets of radio calls, side-lobe signals from microwave relay towers. Often encoded in one way or another, the signals were most often processed at the headquarters of the National Security Agency, on the grounds of Fort Meade, Maryland, between Washington and Baltimore, whose acres of basement held most of the supercomputers in the world.

The task here was to keep constant track of the six hundred frequencies used by the cellular phone net in Medell n. What was impossible for any police agency in the world was less than a light workout for NSA, which monitored literally tens of thousands of radio and other electronic channels on a continuous basis. The National Security Agency was far larger than CIA, far more secretive, and much better funded. One of its stations was on the grounds of Fort Huachuca, Arizona. It even had its own supercomputer, a brand-new Cray connected by fiberoptic cable to one of many communications vans, each of which performed functions that those in the loop knew not to ask about.

The next problem was making the computer work. The names and identities of many Cartel figures were fully known to the U.S. government, of course. Their voices had been recorded, and the programmers had started there. Using voiceprints of the known voices, they established an algorithm to recognize those voices, whichever cellular frequency they used. Next, those who called them had their voices electronically identified. Soon the computer was automatically keying and recording over thirty known voices, and the number of known voice-targets was expanding on a daily basis. Source-power considerations made voice identification difficult on occasion, and some calls were inevitably missed, but the chief technician estimated that they were catching over 60 percent, and that as their identification database grew larger, that their performance would grow to 85 percent.

Those voices that did not have names attached were assigned numbers. Voice 23 had just called Voice 17. Twenty-three was a security guard. He had been identified because he had called 17, who was also known to be a security guard for Subject ECHO, as Escobedo was known to the comint team. "He's coming over to see him," was all the recorded signal told them. Exactly who "he" was they didn't know. It was a voice they had either not yet heard or, more likely, not yet identified. The intelligence specialists were patient. This case had gone a lot quicker than normal. For all their sophistication, the targets never dreamed that someone could tap in on them in this way and as a consequence had taken no precautions against it. Within a month the comint team would have enough experience with the targets to develop all sorts of usable tactical intelligence. It was just a matter of time. The technicians wondered when actual operations would begin. After all, setting up the sigint side was always the precursor to putting assets in the field.

"What is it?" Escobedo asked as Cortez entered the room.

"The American FBI Director will be flying to Bogot tomorrow. He leaves Washington sometime after noon. It is to be a covert visit. I would expect him to be using an official aircraft. The Americans have a squadron of such aircraft at Andrews Air Force Base. There will be a flight plan filed, probably covered as something else. Anything from four tomorrow afternoon to eight in the evening could be the flight. I expect it to be a twin-engine executive jet, the G-Three, although another type is possible. He will be meeting with the Attorney General, undoubtedly to discuss something of great importance. I will fly to Washington immediately to find out what I can. There is a flight to Mexico City in three hours. I'll be on it."

"Your source is a good one," Escobedo observed, impressed for once.

Cortez smiled. " S , jefe . Even if you are unable to determine what is being discussed here, I hope to find out over the weekend. I make no promises, but I will do my best."

"A woman," Escobedo observed. "Young and beautiful, I am sure."

"As you say. I must be off."

"Enjoy your weekend, Colonel. I will enjoy mine."