Tom Clancy'S Under FireOn a routine intelligence mission in Tehran, Jack Ryan, Jr., meets his oldest friend, Seth Gregory. As they part, Seth gives Jack a key and a perplexing message. The next day Jack is summoned by two men who claim Seth has disappearedwith funds for a vital intelligence operation. Insisting Seth has turned, they leave Jack with a warning: If you hear from Seth Gregory, call us immediately. But they don't know Jack. He won't abandon a friend. Jack soon