In "The Secret Man," to be published next week by Simon & Schuster, Woodward writes that he learned in 1976 from then-assistant attorney general Stanley Pottinger that Felt, who had been the number two man at the FBI, had given himself away while testifying before a grand jury. Asked "Were you Deep Throat," Felt initially said "No," but his manner alerted Pottinger to the probability that he was lying. Woodward also reveals for the first time the address of the famous Virginia parking garage where most of his meetings with Deep Throat were conducted: 1401 Wilson Boulevard in Rosslyn. The...