Alec masquerades as a wealthy Australian millionaire to extract a million dollars from ruthless shipping magnate Rodesko but the job is complicated when Alec's affection for Rodesko's fiancée grows.
The rogues get word the President of San Luco has arrived in the US to sell the Stefanini jewels. Miss Harkness explains how the jewels originally belonged to their family and decide to get them back.
Alexander Fleming decides to go after the fortune amassed by General Diaz during his despotic rule of his country. The rest of the clan see real value in stealing his 6 million dollar fortune.
Tony and Timmy learn that officials of a Texas town plan to unscrupulously influence the placement of a space launch site to profit from land they have bought so the two plot to replace the true government officials and collect the bribe.
Marcel encounters Arlene, with whom he had partnered with in the French underground during WWII, and takes a special interest in her son Jamie while pursing a scam on a corrupt foreign official.
In Paris, Margaret, Timmy, and Tony come up against a swindler and his charming cohort who coax money out of unsuspecting, worried parents. They set up an elaborate scheme to try to expose them.
Tony and Margaret scheme to separate a very wealthy Plavonian, known as Mr. Smith, from some of his money, gotten through ruthless, cut-throat tactics. On the way to do so, Tony, posing as a well known international financier, is kidnapped.
In Boston, a friend of Tony's loses his business to a wheeler-dealer named Mannix. Tony schemes to raise the money to buy it back for him by selling Mannix a company he doesn't own.
In Budapest, an old friend engages Marcel and Timmy to smuggle a intelligence computer. When the friend is murdered, corrupt official forces the pair to do his personal smuggling but the two plot to accomplish the original task.
Tony buys an entire lot of 22 ships sold by the US Navy, then offers to sell them to a crooked shipping magnate by convincing the man that on one them, $2 million worth of gold bullion is hidden.
The family concocts a scheme in which Auntie Margaret pretends to be Anastasia so that the Russian government will believe that she knows where the Romanoff fortune is hidden in order to collect a fee for the fortune's surrender.
While salting an old castle with gems to entice a shady buyer, Tony and Timmy stumble across a den of thieves using the castle to stash stolen loot. They escape in a car containing a sack of the money. Complications ensue.
Marcel (Charles Boyer) is set to perpetrate an art swap on stingy businessman Amos Cavanaugh (Broderick Crawford). But Cavanaugh has put a twist to the con by unexpectedly donating his Rembrandt to the SF Art Museum. Fake copies cloud the investigation while they search for the real Rembrandt. The museum and Cavanaugh wish to work the dealings on their own, keeping the press and the police out of it; when several step forward claiming they have the original and asking for a ransom. Can Marcel and the Rouges make everything right by finding and delivering the real Rembrandt to the museum (as promised by Cavanaugh) and then seeing that cheaters don't prosper in this complex double and triple cross.
When the remains of great, great uncle Alexis St. Clair are threatened with removal due to a greedy land developer who wants the property, the entire family comes together to prevent that happening.
When ruthless and unusually wary tycoon Gregg Roberts tries to take advantage of Tony's friend Peter Stewart, Tony devises a scheme to have Roberts invest in a venture involving a new scientific method that produces gold.
Posing as an African safari guide, Tony takes the lead in teaching greedy and abrasive businessman Champion a lesson for cheating safari guide Rutledge by selling Champion a diamond mine that the family does not own.
Tony is robbed of a valuable pearl necklace - that he has just stolen from a crooked jeweler - by The Cat. He plans to recoup his loss by getting involved in The Cat's next caper.
Tony and Timmy are enlisted by an old friend to smuggle gold that will support the underground from East Berlin and need to rescue the friend's daughter from the firing squad.
Marcel and Timmy at Genoa to meet fellow con artist Armand who says a ship's cargo contains an unspecified item of value. After Armand is murdered, the two open shop with his widow to lure someone to identify the object.
Tony as the son of an ostracized MacBride arrives after Amelia has murdered the father. Tony upon learning that his alter ego has been named sole heir renounces the inheritance but asks for swamp land which he later suggests holds oil.
When Timmy's old school friend is murdered in France, he learns that the old friend was just not a painter but an intelligence agent at which time Timmy and Marcel decide to go Paris to investigate what appears to be unfinished espionage.
In exchange for overlooking Timmy's crime, Inspector Briscoe persuades Marcel and Timmy to undertake the dangerous mission of replacing a fake hand of a statue with the real one long ago stolen to prevent Mme. Ka using the theft to organize a coup.
Girlie magazine tycoon Guy Gabriel wants to foreclose on Lady Brayford to acquire her rare book collection. The Rogues devise a scheme using an old Timmy forgery to save Lady Brayford from foreclosure.
Albert Sorel is pushed from a Swiss ski lift by two men but daughter Madeleine, Tony's friend, is informed by police her father died 20 years ago. In France Sorel's old friend Duval confirms this as two 'German cousins' appear in town.
