An ex-college football player serving a prison sentence for bank robbery, escapes. He is a runner again, trying to capture a lost love, trying to recapture part of his past. Erskine and Colby lead the FBI's manhunt, which leads to a remote part of Oregon. Erskine and another agent perform a parachute jump as part of the effort to capture the escaped prisoner.
Alan Graves stages his own kidnapping, extorting money from his father-in-law so he can run off to Europe with a younger woman. Erskine and Colby head up the FBI's investigation and figure out the deception. Graves, meanwhile, is running into trouble. He is robbed when attempting to buy fake passports. His girlfriend also has attracted the attention of an old flame who intends to make his own score at Graves' expense.
Erskine and Colby travel from New York to Atlanta, leading an FBI investigation of a gang specializing in theft of expensive art items. The gang's M.O. includes a woman who becomes friendly with a guard, permitting her to find ways for the robberies to occur. However, the gang is also a pawn of others who have their own agenda.
A man and woman specialize in a certain type of con. She seduces rich men while he prepares elaborate forgeries of historical documents that's also part of the bait. Their latest con involves phony papers supposedly written by Benjamin Franklin. Erskine and Colby are on their tail. The woman is falling in love with her latest target. But the man has been joined by his estranged wife -- and she has her own ideas how to proceed.
A "gopher," angered by the treatment he has received from the head of a mob loan sharking operation in New York, takes a book containing key records. This happens just before a raid by the FBI. Now both the bureau and the mob are seeking the records. The gopher has to grow up fast to stay alive. The question is whether Erskine and Colby can catch him before the mob does.
Erskine and Colby lead the FBI's cross-country chase against an escaped federal prisoner. Their quarry seeks revenge against various people he blames for separating him from his estranged wife. The FBI men travel to Los Angeles to Tampa to Peru, Indiana. The escaped prisoner has injured people everywhere he has stopped. It's clear the escaped prisoner obsesses about his estranged wife.
An unemployed aerospace engineer participates in a bank robbery but is double crossed. Desperate, he plans a new robbery where he will call the shots. He recruits one of his former co-workers for assistance. Meanwhile, Erskine and Colby, who are investigating the first robbery, are now on the engineer's trail.
Plans that are part of a top secret U.S. government project are stolen. An independent operator intends to sell them to an Eastern Bloc nation. But the two sides don't trust one another and each is out to gain any advantage it can. The FBI gets a break when a visiting Eastern bloc scientist - who wants to defect to the U.S. - informs the bureau he has been contacted to help verify the plans. But the scientist is injured in a lab accident before he can see the plans. Erskine takes his place and goes undercover. This time out, things will be even more dangerous for the ...
George Barrows successfully embezzles a large sum of money from the bank where he has worked. But that's only seed money for Barrows' next caper, which he has been planning for an extended time. Erskine and Colby have been assigned by the FBI to track down the fugitive. The question is whether they can catch up and prevent the larger robbery that Barrows has planned.
Erskine and Colby are on the trail of a loner who has committed robberies across several states. The loner travels to Georgia, where his sister has just died. Other criminals believe they can take advantage of the loner. But a trail of violence ensues instead.
Three men rob a Northern California resort of $200,000 in currency and jewels. They cross the state line into Oregon, bringing the FBI into the case. Erskine and Colby take charge of the investigation because they're already in the general area. The airplane the men fled in has been disabled. They split up and two of the men abduct a couple rafting on a remote -- and hazardous -- river.
Kidnappers con the daughter of a rich couple into going out of town. In reality, the young woman has been kidnapped. They are holding the young woman for a ransom of $200,000. One of the kidnappers is the maid of the rich couple. Erskine and Colby take charge of the case. The FBI men need to figure where the kidnap victim is. The mastermind of the plot doesn't plan on the victim saying alive for long.
The FBI is after the "Jug-Marker," the mastermind behind a series of robberies across the Southeast United States. The Jug-Marker relies on a band of men to perform the robberies, led by the unstable Murzie. The Jug-Marker and Murzie don't trust each other, but they need each other. The Jug-Marker provides the brains and cunning to successfully plan the jobs while Murzie keeps his men in line. As Erskine and Colby follow the gang's trail, the FBI men look to separate the unlikely partners.
A member of the Organization has supervised the hijacking of a load of whiskey. But the job didn't go smoothly, leading to a severe injury to the driver. The FBI is assigned to the case because the shipment has crossed state lines. As a result, the Organization wants such hijackings to end until things cool off with the law. The organizer of the job is also told by his superior that his fiancée doesn't meet with the Organization's approval. So the organizer decides to moonlight and do a job on his own, to give him a stake so he and his fiancée can go off on their own.
Hitman Stuart Tilden seriously wounds a businessman in Chicago while seeking the whereabouts of his intended target. The FBI launches an intense investigation, seeking to prevent Tilden from succeeding, and even Assistant Director Arthur Ward will make an arrest in the field as part of the effort. The target is Richard Ghormley. Ghormley formerly worked for a criminal. While Ghormley wasn't involved with illegal activities, the criminal fears that Ghormley knows too much. Ghormley is desperately trying to get home on Christmas Eve from a business trip to San Francisco...
The FBI gets a break in its investigation of loan sharking by the Organization. In Denver, the son of a key Organization member has been arrested for assaulting a loan shark victim who was slow on his payments. A family friend of the Organization father and son agrees to take the rap, accepting $25,000 as an initial payment with the promise of more to come after he serves his sentence. But the son isn't satisfied and wants to tie up all the loose ends himself. Erskine and Colby try to break the conspiracy before harm comes to anyone else.
A priceless diamond has been stolen from a retired millionaire in Oregon. When evidence emerges the thieves have fled to Northern California, the FBI enters the case. Erskine goes undercover as an associate of the retired millionaire. He is to negotiate for the return of the diamond for a ransom. But when other criminals begin to gather, the situation becomes more complicated, and dangerous, for the FBI man.
A bitter man, whose father was crippled working for mining companies, decides to seek revenge. He appears to be extorting mining executives. In reality, he intends to kill them. Erskine and Colby head up the FBI's investigation. Erskine takes the place of one of the executives and comes face to face with his quarry.
Erskine and Colby are bringing John Omar Stahl, a Ten Most Wanted fugitive, back to the United States. Their aircraft is forced to crash land and Stahl escapes. An injured Colby remains with the plane's passengers while Erskine, nursing his own injuries, tracks down Stahl. The fugitive knocks out a ranger and contacts his brother and a meeting is set. Stahl's brother, meanwhile, has a relationship going with Stahl's former girlfriend. Assistant Director Arthur Ward, already in the San Francisco area, arrives to supervise the search for Erskine and Stahl. Erskine must ...
Erskine and Colby are on the trail of two confidence men, who've conned victims across several states. For each caper, the pair recruit a beautiful woman, who they then ditch before she can collect her share of the proceeds. But their latest woman partner may be more than they can handle.
Della Marot leads a double life. On the surface, she appears to be the respectable owner of a bar and restaurant in New Orleans. But she is really the mastermind because of a series of bank robberies and other thefts. Della, however, is tired of the criminal life and wants to retire and be with her 12-year-old daughter, who is off at boarding school. Erskine and Colby investigate a Baton Rouge bank robbery, which puts them on a trail that eventually leads to Della.
A member of the Organization, Albert Dirks, has a grudge against a county prosecutor, William Sanders. Sanders was responsible for sending Dirks to prison, during which time his wife died. So Dirks has put out an unauthorized contract on the prosecutor. Dirks has hired Alex Tanner, who likes to kill his victims with bombs. Tanner's first attempt injures another man instead. Because the murder attempt took place on federal property, the FBI is assigned to the case, with Erskine and Colby spearheading the investigation. The Organization wants no further attempts made on...
Beau Parker, a Ten Most Wanted Fugitive for bank robbery, and Cass Linden have teamed up for a series of thefts. The pair make a stop at the Tennessee town where Cass grew up and visit her little sister Mary Ann. Mary Ann opts to leave with them. It turns out Mary Ann likes the criminal life - and may be more than willing to kill. Erskine and Colby track the group across multiple states. Meanwhile, Beau is planning his biggest job yet.
Gus Benderson, a colorful safe cracker, has been recently released from prison. He participates in a jewelry heist that goes bad when one of the three participants is wounded. Benderson then visits his son, Robert, who hasn't seen his father for years. The younger Benderson is just starting a life of crime -- and refuses to listen to the warnings of his father. Erskine and Colby are on Benderson's trail, which leads to Southern California, where the younger Benderson lives. Father and son are going to do a big job before Gus retires.
The son of a rich South Florida contractor befriends people who, in reality, plan to kidnap him. Erskine and Colby supervise the FBI's investigation. Things are complicated when, during a ransom drop, a motorcyclist spots the ransom and takes it. The motorcyclist isn't involved in the kidnapping and is apprehended by the bureau. Now, the kidnappers are on guard more than ever.