She is tall, glamorous, speaks Mandarin Chinese and for nearly 20 years served as a case officer for the CIA. No, she's not the model for "Alias'" Sydney Bristow--but my friend Martha Sutherland, who a few years back retired from the Agency to become a Manhattan-based dealer of contemporary Chinese art. Why do I bring her up--besides introducing you to a fascinating person? Because when the New York Sun asked her last week to nominate her favorite books of the year, one of her choices was--you guessed it--In the Red Zone. Xie, xie, Martha.