Title from web page.

It begins with a family dinner in Princeton, New Jersey. After months at sea, U.S. Navy Commander Scott Hagan, captain of the USS James Greer, is on leave when he is attacked by an armed man in a crowded restaurant. Hagan is shot, but he manages to fight off the attacker. Though severely wounded, the gunman reveals he is a Russian whose brother was killed when his submarine was destroyed by Commander Hagan ship. Hagan demands to know how the would-be assassin knew his exact location, but the man dies before he says more. In the international arrivals section of Tehran Imam Khomeini airport, a Canadian businessman puts his fingerprint on a reader while chatting pleasantly with the customs official. Seconds later he is shuffled off to interrogation. He is actually an American CIA operative who has made this trip into Iran more than a dozen times, but now the Iranians have his fingerprints and know who he is. He is now a prisoner of the Iranians.