Former FBI agent Robert Hanssen traded national security secrets to Russia for $1.4 million in cash, and got away with it for 20 years. But a new book says it was Hanssen's ego -- more than his wallet -- that was being fed. Hear Hanssen's story through the eyes of author David Vise. (7:15) (The book is called The Bureau and the Mole: The Unmasking of Robert Philip Hanssen, the Most Dangerous Double Agent in FBI History, by David A. Vise. ISBN 0-87113
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