Nuclear Alert (Buck Danny)

Most of the novel follows two separate plots, one for the protagonists and one for the villains. The former - Buck Danny, Jerry Tumbler and Sonny Tuckson - are now pilots on the USS John F. Kennedy and have recently transferred to flying F-14 Tomcats. The trio of pilots is temporarily reassigned from their training exercises in the Caribbean, to represent the United States at an air show in the fictional Central American nation of Managua.

Meanwhile, Interpol and U.S. intelligence have been observing an increase in criminal actions throughout the world, which they believe are being committed by the same people. They are revealed to be an anti-capitalist terrorist organization, which steals three nuclear weapons from the U.S. Air Force during the novel and plans to use them to wipe out the upcoming North–South Summit in Cancun, hosting all the major world leaders outside of the Eastern Bloc and China.

The two plot lines are joined at the end of the novel, when the terrorists - having hired Lady X, the heroes' nemesis - succeed in stealing two of the three F-14s in Managua, which they intend to use as a delivery system for the bombs (the F-14 being the plane best capable of penetrating the security screens that will surround the conference). Danny is ordered to Washington to give his report of the events.

Following the events of the previous novel, the President of the United States (Ronald Reagan) is contacted by the terrorists. Identifying themselves as the International Federation of Armed Revolutionary Groups, they demand the release of all terrorists currently held in NATO countries, or they will deliver the F-14s and nuclear weapons to the Soviet Union. Instead, the President decides to stall for time while the U.S. Central Intelligence Agency and other NATO services try to locate and neutralize the IFARG base.

Danny, however, believes the terrorists' demand may be a feint and that the terrorists could be planning to actually use the weapons on a target in the Western Hemisphere. CIA is skeptical, but Admiral Walker allows Danny and Tuckson nine days of shore leave, during which they rent a private aircraft and systematically overfly the deserted islands in the Caribbean where the terrorists may have hidden the Tomcats.

Meanwhile, there is dissension in the terrorists' ranks when one of their Mexican members, Juan, expresses his concern for collateral damage from the operation. In order to preserve cohesion within the group, the terrorists allow him to escape on a boobytrapped raft, thus Juan dies at sea far from the eyes of his friends. However, his body is found by Danny and Tuckson, who also find a message warning them of the IFARG's true plans. But one of the terrorist Tomcats appears and destroys their plane, along with all their communications equipment, leaving them stranded on a deserted cay and out of contact with the world.

The novel opens with Danny and Tuckson being rescued from the cay by a Cuban fr:Classe SO-1[1] corvette (patrol boat), which, made suspicious by the presence of American aviators in the area, takes them both prisoner. The Americans, in desperation, force a brig break and are rescued shortly thereafter by a helicopter from Guantanamo Naval Base. They are then put in touch with Admiral Walker of the Kennedy and report what they have learned. Walker orders them back to the ship and places it on nuclear alert, but the President is due to land in a few hours and the summit can no longer be called off.

Reagan, once informed of the crisis, arranges for the media to delay news of his arrival by one hour; this allows the Kennedy to evacuate the leaders from Cancun, and to position its fighters to intercept the terrorist planes. When the IFARG, hiding in the Exuma islands, receive the delayed news of the President's arrival in Cancun, they launch the final phase of Operation Apocalypse, and release their F-14s carrying one nuclear bomb apiece.

The F-14s approach Cancun by using Cuban airspace for cover, but are detected by an American AWACS. In reaction, they split up with one turning north to attack Cape Canaveral, and one continuing towards Cancun, forcing the Kennedy's fighters to split up. Danny and the squadron's F-14s shoot down the first aircraft over Florida. Tumbler, flying an A-7 Corsair, tries to intercept the second one near Cancun but his older missiles are insufficient; instead, he crashes his fighter into the enemy, barely managing to eject before the explosion.

With Operation Apocalypse foiled, Lady X and the remaining terrorists evacuate their base and flee to safety. Danny, Tumbler and Tuckson receive the thanks of a grateful President Reagan, and will receive the Medal of Honor for their part in stopping the nuclear attack.