Pepe Montillo is a Spanish matador who superstitiously believes that his prayers to a particular holy image, La Virgen de Macarena, protect him from death on the horns of a bull. The image wears robes adorned with precious gems and a string of valuable pearls around its neck. When it is stolen, Pepe refuses to fight until it is returned. To conceal his superstitious fear, he claims to be ill. Robin is hired to recover the image and its jewelry by the insurance company that insured them for five million pesetas. He discovers that the theft may have motives beyond money, including a desire to prevent Pepe from returning to the ring. In the end, he traces the theft to Pepe's cousin Carlos, a wealthy playboy who wanted to recoup his gambling losses.

Hired to recover a stolen two-hundred-thousand-dollar payroll, Robin Scott discovers that Al Martin, the robbery gang's sole survivor, is about to be paroled. Robin must force Martin to lead him to the loot. Using his own investigative methods, he learns that Martin's wife and Mike Durand, whose brother was killed in the robbery, are planning to double-cross the ex-con. Shortly after Martin's release from the penitentiary, Robin sets a ransom plot in motion—only to find himself suddenly put out of commission. He escapes a tight squeeze and discovers that time and hate have corroded not only the people involved but the money as well.

Robin is hired by the Insurance Alliance to investigate a fraud ring that has made millions over the years through false personal injury claims. Going undercover as a flopper—a man who fakes injuries—he is eventually hired by Milt Danzig, who runs the local branch of the illegal organization. Robin is soon caught trying to steal important records, but rather than abandon his assignment, he puts himself in even greater danger by attempting to blackmail the ring's higher-ups. The risky maneuver pays off when Robin, at the risk of his life, secures evidence against not only Danzig and his local associates but also the organization's national boss.

Charlie Quentin, a CPA (certified public accountant), is released from jail on $200,000 bail after being charged with murder. The insurance company discovers that, to have the charge reduced to a bailable offense, Charlie identified a string of layoff books across the country belonging to the crime cartel known as the Syndicate. Fearing he will be killed before his scheduled court appearance, the company hires Robin Scott to keep him alive and deliver him to court on the trial date, thereby exonerating the bond. Robin visits Charlie's mother, Carmen, at her place of business, where he encounters Syndicate representative Vic Shultey and one of his henchmen. After a tussle, Robin enlists the help of Carmen and her daughter, Ruth, who direct him to Charlie in California. As Robin tries to persuade the gentle Charlie to abandon his search for the man who framed him, two hoods arrive and take them all to Syndicate boss Martin Turk.

When Eurasian movie actress Domenique Chan is nearly killed, the company insuring her latest picture calls in Robin Scott. He stuns Domenique, her producer-director-writer husband Larry Galloway, British actor Allen Hendricks, and karate expert Agato Nakamura by bluntly declaring that he suspects an insurance fraud scheme is underway. Robin's suspicions are confirmed when he is trapped in a projection theater, where an unseen gunman attempts to kill him. Domenique then promises to reveal who is behind the attempted fraud and killings, but before she can meet Robin, she is found dead in what appears to be a suicide. The investigation leads Robin to a deserted movie studio late at night. There, after a desperate fight for his life against the criminals involved, he obtains proof that Domenique was murdered as part of the insurance fraud scheme.

Robin Scott travels to Java to investigate a plantation owner's insurance claim after a fire allegedly destroys his entire coffee crop just before harvest. Assigned by the insurance company to look into possible fraud, Robin becomes embroiled in a strange triangle and a murder, at one point finding himself the prime suspect.

Robin Scott must recover a hijacked shipment of gamma globulin, a perishable serum used to treat hepatitis. With an epidemic raging, the medicine is urgently needed—and insured for a substantial sum. He travels to Manila without a single clue, lures the thieves into coming to him, and ends up a prisoner of the eccentric Mortar McCoy, an American deserter who leads a band of brigands. Even in captivity, Scott manipulates events to put himself in a position to buy back the drugs with worthless invasion currency, escaping just ahead of death.

Three partners in Rupert Courtney Associates embark on a macabre venture to collect a large insurance tontine they established years earlier. They agree to gamble two of their three lives through suicide, leaving the lucky survivor to collect the entire payout under the survivor-takes-all policy. Courtney, who devises the scheme, intends from the outset to manipulate the odds. Robin Scott becomes involved through the firm's secretary, Delisa Monetti, a luscious Italian woman he met in Rome during an earlier case. His investigation remains one step behind the killer's shrewd machinations, and one man dies before Robin forces a confrontation that leads Courtney to kill himself—the only genuine suicide. Ironically, Harry Winslow, whose thwarted suicide attempt inspired the scheme in the first place, ends up with all the money.

When a privately owned luxury yacht mysteriously explodes at sea, killing its wealthy owner, C. J. Hargrove, Robin Scott accepts an insurance company's assignment to investigate the circumstances surrounding the costly disaster. Through an unorthodox meeting with the deceased's daughter, Lydia Hargrove, her fiancé, Al Gilman, and her companion, Amy Wilde, Robin uncovers his first lead: a remark by Gilman that mentions the name Harmon. Following the lead, Robin locates Harmon and uncovers information linking him, Gilman, and Amy to the catastrophe. Moving quickly to counter Robin's investigation, the three nearly succeed in killing both him and Lydia. But Robin senses the truth in what others might dismiss as Lydia's insane ramblings. At the crucial moment, he devises a way out—one that brings Al Gilman and Amy to justice and costs Harmon his life.

After a major operation, wealthy Justin McDermott is murdered in the hospital when someone injects a hemorrhage-inducing drug into his transfusion line. McDermott's nephew, penniless playboy Kenny Calvin, sues the surgeon for malpractice, drawing Robin Scott into the case. As Robin investigates Calvin, he begins to suspect murder rather than malpractice. An attempt on his own life convinces him he is on the right track. When evidence suggests that Calvin may be being framed, Robin makes sure everyone involved understands that a murder conviction would prevent Calvin from inheriting his half of McDermott's substantial estate. This tactic draws the real criminals into the open, allowing Robin to apprehend them and clear both Calvin and the surgeon of false charges.

Baffle, a valuable racehorse owned by a Texas millionaire, falls during a California stakes race, killing both horse and jockey. Investigating on behalf of the horse's insurer, Robin discovers that Eastern bookies and Chicago layoff houses suffered heavy losses on the race. He concludes that Baffle was unfit to race and that his trainer had rigged the event in collusion with the track veterinarian and the crooked jockey riding the second favorite. As Robin builds his case, however, he learns that the trainer is innocent. In the final showdown, he pins the crime on the real culprit: Baffle's owner.

When Robin Scott accepts an assignment to investigate statewide unemployment insurance fraud, he must work entirely alone, with no clues or theories about how—or by whom—the fraud is being carried out. After a quick review of the state's insurance program, Robin still doesn't know where to begin until a newspaper article catches his attention almost by chance. It reports that a young man carrying five Social Security cards has been found beaten to death on one of the state's remote country roads. A swift investigation into the victim's background and associates leads Robin to develop a theory that others consider far-fetched: the murdered youth was a small cog in the machinery of the statewide swindle. After a near-fatal encounter with two members of the operation, Robin poses as a racketeer to make further contact with the gang.

Robin Scott travels to Hong Kong to investigate an insurance claim involving a cargo of tin allegedly lost overboard from the tramp freighter Natuna Star. Captain Thane, who holds a grudge against insurance companies, and his crew have stolen $100,000 worth of tin ingots en route from Singapore to Hong Kong, claiming they jettisoned the cargo to save the ship during a storm. Suspecting barratry, Robin enlists the help of skin diver Danny Wayne and gains the confidence of Thane, first mate Vernon, and Sparky Tanjong, the ship's mixed-race Malay radio operator. He then stages the kidnapping of Phyllis Collier, who happens to be in Hong Kong, and bribes his way aboard the Natuna Star, hoping to be led to the island where the stolen tin is hidden. Thane and his crew double-cross Robin, intending to keep the supposed ransom for themselves. After a deadly fight on the island, Robin defeats the villains and recovers the ingots—only to learn his fee will be paid in Hong Kong dollars, each worth less than 25 American cents.

In Amsterdam to recover the enormous Granada diamond stolen from jeweler Wilhelm Joost, Robin Scott learns that safe expert Andre Dupre recently installed a new lock on Joost's safe and then died aboard the Amsterdam-to-Paris train. In Paris, Robin discovers that Dupre's attractive widow is friendly with Rosaire, a known criminal, and Schroeder, a railroad detective who was traveling with Dupre when he died. After Rosaire first tries to bribe Robin and then attempts to kill him, Robin realizes that the thieves cannot sell the stolen diamond until it has been recut. He tracks down Van Hessen, a lapidary forced to recut the gem by threats against his family. Using a ruse, Robin lures the thieves and the diamond into Van Hessen's home. There, after the diamond appears to have been smashed to pieces, Robin apprehends the criminals and recovers the genuine Granada diamond.

Robin Scott's apartment is burglarized and bugged by a cunning gang of swindlers led by Fred Caine, an unscrupulous private investigator, and Jack Hayes, who looks and talks like Robin. After pulling off an ingenious $200,000 swindle, the gang kidnaps Robin and takes over his apartment to prevent him from exposing them. Left to die in the trunk of his car, Robin survives and is rescued. He then sets a trap for the gang, baiting it with half a million dollars' worth of jewels. The swindlers take the bait and are caught, but Caine and another gang member, Oscar Bradley, die accidentally in the process.

Robin travels to Mexico City hoping to recover a stolen miniature cradle containing valuable cargo hidden inside a cheap rag doll.

While birdwatching with Phyllis, Robin sees a couple discard some old clothes, strike a man over the head, and force him into their car. He tries to follow them but loses their trail. Later, while searching for the discarded clothing, he is shot at. Angered by the attack, he becomes determined to get to the bottom of the mystery. His investigation uncovers a gang that has been defrauding insurance companies by passing off the bodies of people with no friends or connections as those of insured individuals, allowing them to collect payouts on multiple policies. Robin catches up with the gang just in time to save their next intended victim: a girl who is to be passed off as the wife of one of its members.

When insurance investigator Johnny Flood overhears Burt Hobson and Garth Briggs plotting the biggest bank heist in history, they catch him and try to kill him. Johnny escapes, but his wounds are so severe that he can share only a few details about the vault job with Robin Scott before he dies. Johnny's fiancée, Laurie Tibbs, blames Robin for his death and resolves to kill him. So do Hobson and Briggs, who discover that Johnny spoke to Robin before dying. Robin narrowly dodges Laurie's bullet, then persuades her to help him track down Johnny's killers. Her cooperation nearly costs her her life, and Robin guesses wrong about the vault job. Ironically, that wrong guess gives him the right answer—and leads him to the crooks just in time.

Emile Masters, a gifted jeweler, emerges from prison after seven years with two goals: to murder Robin Scott, the man responsible for his imprisonment, and to swindle the Peerless Insurance Co. out of a quarter of a million dollars. When his attempts to kill Robin fail, Masters draws him into the insurance scam, hoping to lure him to his death. Robin catches on to the scheme but remains unaware that Masters is holding Phyllis hostage to safeguard his plan. After forcing one of the crooks to reveal where Phyllis is being held, Robin races against the clock to rescue her.

A notorious jewel thief arrives in New York just as a prominent jewelry store is about to unveil an exhibition of valuable gems.

Steve Whelan threatens to commit suicide over his wife's infidelity, but her boyfriend, Eddie Nelson, sends him over the cliff with a gentle shove. Robin is called in while the insurance company believes Steve is still on the cliff. He goes there, only to find no sign of Steve and a mysterious assailant who shoots at him. Concluding that Whelan is still alive, Robin picks up his trail and follows it north. When the trail goes cold, Robin reconsiders and realizes that Eddie murdered Whelan. Eddie's plan is to make Whelan appear alive for three more days to take advantage of the two-year cancellation clause in his insurance policy. Robin then feigns romantic interest in Linda to lure Eddie out of hiding and unravel the scheme.

The theft of $100,000 worth of jewels from a Long Island socialite introduces Robin Scott to a gang of dangerous hoodlums disguised as playboys.

Thelma Henderson is missing, and Rick discovers that her husband Walter has heavily insured her life.

 

Robin flies to Antwerp, Belgium, in an effort to track down a valuable notebook filled with research information.

Robin learns he is driving a sports car which is identical to that of a popular singer. After surviving the sniper who planned to do away with him, Robin learns it was a case of mistaken identity. The singer was the assassin's intended victim.

Robin Scott sets out to find the thief of the fabulous "Heart of Buddha" ruby and he is forced to make a strange alliance with Kang, a Burmese robber baron.

A highly insured Shakespeare first folio is stolen from a London university.

Robin travels to Paris to search for a stolen pair of emeralds.

A bomb goes off in a bus, and the chief suspect is the son of one of the dead passengers.

Insurance agent Robin Scott is assigned to investigate an airplane, carrying half a million dollars in gold in payment for Arabian oil, which has been hijacked at the Tripoli airport. The quest leads him to a Spanish beauty and an ex-Nazi officer.

In Geneva, a masked band of thieves steal a valuable coin collection at gunpoint. Robin is put on the case, and finds out among other things, the stolen ducats were fakes.

Robin while investigating an insurance fraud in Guatemala runs afoul of a big game hunter and a beautiful local businesswoman.

A doubtful insurance claim is offered by a seductive widow who offers $20,000 to recover a missing jade statue in Acapulco.

 

Death claims the heavily insured Mrs. Warren, whose beneficiary is Ravenna, a medium. A beautiful hypnotist and a jealous giant plot to make insurance negotiator Robin Scott the next victim in their string of murders.

Robin is persuaded by a friend at an English insurance company to investigate a small oil company on the Dutch-owned island of Curaçao, where an unusually high number of newly hired employees have died in accidents. The fraud seems obvious: new employees are required to take out accident insurance policies, with the company paying the initial premiums and becoming the beneficiary for the first six months. Yet there is no way to prove the scheme. Robin travels to Curaçao expecting to make contact with a member of the oil crew planted there by the insurance company. Before he can do so, however, the man is caught and admits that an unidentified investigator will arrive with the next group of employees. Robin thus finds himself without help and marked as the next victim of an accidental death—until he devises a plan not only to save himself but also to force the murderers to provide the proof needed to establish their guilt.

Robin Scott becomes entangled in a scheme when a man with income tax problems offers him $50,000 to kill someone.

A concert violinist collects the insurance payout on a stolen Stradivarius, drawing Robin Scott into a tangled web of double-crosses. As Robin investigates the theft of Maestro Ascoli's prized instrument, he uncovers a fraud.

The only copy of the manuscript of a new novel by America's young literary lion, Addison Hanks, is stolen by two tribesmen in Mozambique, Africa. Robin goes to find it. Hanks looks suspicious because he acts suspiciously; Molly Sullivan, Hanks's agent, warns Robin to stay away.