Kelly and Scotty are in Tokyo to help a Russian professor defect. Their cover story is they are giving tennis lessons to an American businessman's daughter. Plans go awry and the Russians retaliate by kidnapping the girl.
Scotty and Kelly combat a ruthless gang of smugglers who have co-opted an entire fishing village into their scheme. Although totally unarmed, with a little help from the villagers they might have a chance.
Alexander Scott, traveling undercover in Mexico as Dr. Smithfield, is abducted along with three other agronomists that an amiable freelance spy is planning to sell to a foreign power. Kelly teams up with a taxi driver to track down his kidnapped comrade.
Scotty sportingly bets Kelly a dollar that he is capable of tracking down his friend anywhere in Mexico within a week. But the hide n' seek game becomes desperately urgent after Scott learns Kelly has unknowingly been infected with anthrax that will kill him if not treated within 24 hours.
A question over a five-dollar expense account item for "glass pants" for Scotty's mother leads to the boys recounting for Miss Clavell the whole story of their assignment to General Ortiz, democratic leader of an island republic ousted in a revolution and now living in exile in Taxco, Mexico. The general is seeking the United States' assistance in waging a counter-revolution, but Ortiz's wife is suspiciously resistant to allowing Kelly and Scott meet the general. Why the cover-up?
Kelly's girlfriend insists she was rescued by the Aztec god Quetzalcoatl. Kelly and Scott's investigation of her claim soon dovetails with their assignment to locate a Soviet Air Force pilot thought to be defecting.
Kelly and Scotty are assigned to beautiful Palm Springs to vet a beautiful defector with some truly interesting secrets. A wonderful setting for a budding romance with Kelly if only the bad guys would stop shooting at her.
Members of an elite nuclear test detection team have died violent deaths one by one. When the fifth team member is killed right before Scotty's and Kelly's eyes, they are assigned to protect the sole surviving member and find the killer. The prime suspect is the seventh man who washed out of the team and happens to be a friend of Scotty. Scotty tries to reach him though his sister, a singer performing in Las Vegas. But gaining her cooperation will require more than persuasion. It will require a carefully conceived trap.
On vacation in Italy our duo happens upon a girl Scotty was sponsoring over the years. Now full grown she is preparing to marry. Scotty soon learns he may be able to handle enemy spies, but his foster daughter, her fiancé; and the Italian traffic court are entirely different matters.
A local family in Italy kidnaps Kelly with the intention of holding court over him for the death of their favorite son in the Korean War. Once again Scotty's investigation and recovery skills prove lacking in his efforts to rescue Kelly. Maybe he'll have more luck as his lawyer.
Kelly and Alexander are charged with apprehending the mastermind of a scheme to turn city-wide power outages into a marketable commodity. Two complications; Alexander has little confidence in his aide and cover identity, an agent with little field experience posing with her son as his wife, and his only link to the schemer is a psychopath.
Alexander and Kelly receive the unenviable assignment of guarding a spoiled, teenage king. But it gives Alexander the opportunity to teach the future leader a lesson or two in maturity if he survives his assassination attempts.
Kelly and Alexander are abducted and impersonated by two enemy agents. Their intent; to get close to a defense contractor, kidnap his daughter and force him to turn over secret weapons designs. As Kelly's and Alexander's escape attempts continue to go awry one wonders if they are up to rescuing the fair maiden.
A beautiful tour guide, a handsome tennis pro and the romantic city of Venice would make for an intimate friendship if the tour guide didn't like to slip knives between men's ribs. As American agents drop like flies is Kelly safe?
Kelly and Alexander are sent to a little town in Italy to recover the payload from a nuclear armed aircraft that crashed nearby. They soon find that the towns folk found the plane rather useful. A few people even thought the bomb might come in handy.
An incompetent thief pursues a beautiful woman returning a priceless painting to Florence. Kelly and Alexander are assigned to provide clandestine security. Of course when a beautiful woman is involved Kelly is not one to hide in the shadows.
With the help of Kelly and Alexander the Da Vinci Madonna was delivered to its new home in Florence. But alas, the previous owner reports it is a forgery. Where did our boys go wrong? Now they have to track down the thieves, recover the painting then steal the forgery and replace it with the real painting.
In order to gain attention from a father absorbed in his high-level engineering work, thirteen-year-old Alan steals from him an electronic prototype essential to the country's security and runs away with it.
Some heroes are motivated by duty. Others just want to impress their father. Whatever the reason, Alex and Kelly receive one of their dirtiest assignments; to train a young rocket scientist to resist torture and then to rescue him when he's captured.