On a warm summer's eve, on a train bound for Los Angeles, a noted gambler is found murdered in his compartment, the door of which is locked from the inside and every other means of entrance is sealed. Boston Blackie, also traveling on the train, attempts to solve the case. Will he know when to hold 'em and when to fold 'em? And will he be able to walk away once the dealing's done?
Boston Blackie gets on the trail of three men who have robbed an armored car and killed a policeman in the process.
The police find a woman wanted for fraud in an oil land scheme murdered in Blackie's apartment. He investigates in order to clear his name.
After a man is found murdered in a restaurant phone booth, Blackie investigates and discovers that the eatery is a front for a counterfeiting ring.
A blind begger holds the key to unlocking a mystery.
Blackie finds himself accused of the murder of a man who was mixed up in a fraudulent fortune telling racket.
A man, desperate for money to finance his child's operation, hires someone to kill him so that the child will inherit his life insurance proceeds. It's Blackie to the rescue when the man comes into money from an unexpected source and no longer needs the hitman, who's determined to see the job through.
Blackie's nemisis on the LAPD, Inspector Faraday, reluctantly asks him to lend a hand in a murder investigation.
During the course of a murder investigation, Blackie discovers that empty beachfront houses are being used to smuggle illegal aliens into the country.
A young police detective feels that his brother's murder is not being investigated thoroughly enough by the department and asks Blackie to look into the matter.
Blackie is on the case when a toy factory draftsman is found murdered.
After a man falls to his death from a speeding roller coaster, the police say it was an accident. Blackie, on the other hand, isn't so certain.
Blackie is hired to find missing top secret documents that were stolen by a recently paroled criminal. The trail leads to a power plant.
When a man is killed by some unknown poison, his wife asks Blackie for help but then she dies by the same method.
A dealer in rare books is found dead on a deserted path in Griffith Park. Blackie is hired to look into things.
Blackie's foes this time are female teenaged hellcats who have committed a series of supermarket hold-ups and then taken his secretary/galpal Mary Wesley hostage.
Blackie investigates the death of man killed by a high-powered hunting rifle.
Galpal/secretary Mary Wesley gets Blackie to investigate the mysterious death of a fellow secretary.
A blackmail victim approaches Blackie for assistance.
After a diamond cutter friend of his is framed for murder, Blackie jumps into the midst to set things right.
The brother of a convicted killer is convinced of his sibling's innocence and gets Blackie to investigate the matter.
A nightclub piano player suspects something is wrong with her son and asks Blackie to look into things. In reality, Mommy doesn't know the half of it. Sonny is involved in a double life of crime and murder.
Blackie is approached by a Hollywood director who needs his help.
Blackie travels to Chinatown to investigate a murder which took place there.
An actor goes to Blackie for help after discovering that his agent is the mastermind behind a series of jewel thefts in Hollywood.
Blackie matches wits with a scheming female who's plotting to have her husband murdered and the man with whom she's having an affair framed for the crime.
Blackie's housekeeper hires him to clear her brother who's been accused of assault.
A killer is systematically bumping off everyone who could convict him and Blackie finds himself next on the list.
A fashion designer's life is threatened when her estranged husband decides to make a hostile takeover of her business.
Blackie and galpal Mary attend an engagement party and wind up having to solve the murder of the prospective groom.
A burglar, a shady lawyer, and a bus terminal are the keys in Blackie's attempts to recover incriminating letters about a young woman.
Blackie's vacation plans are interrupted when an actor friend of his is falsely accused of making an attempt on a director's life.
A crook gets shot down while attempting to tell Blackie about his activities.
When Blackie attempts to clear a client of a hit-and-run charge it leads to a complex case of murder on a movie set.
A hold-up gang holds Blackie's galpal, Mary Wesley, hostage in order to prevent him from going to the police with their identities.
Blackie befriends a college student/boxer who's torn between an academic career and winning fame and fortune in the squared circle.
Blackie tries to convince an old friend, who's now a wanted fugitive, to turn himself into the authorities.
Blackie tries to convince a friend who works for a protection racket to go straight but the friend is found murdered shortly afterwards.
Blackie tangles with industrial diamond smugglers operating along the Mexican border.
Blackie gets jailed for his own protection against a mobster who threatened his life. But is he really any safer behind bars?
A bank robber escapes from prison and immediately resumes his former profession. He's identified by a teller and later capture by the police but an accomplice kills the teller. Blackie then tries to protect the teller's wife.
Blackie tries to vindicate an ex-convict taxi driver whom he once sent to prison.
Blackie is hired to accompany an importer carrying ransom for his kidnapped wife.
Blackie goes in pursuit of a thief who unwittingly stole a time bomb along with a horde of jewels.
A man whose secretary was mysteriously murdered tries to get Blackie to provide him with an alibi.
Blackie steps into the middle of a quarrel between two feuding brothers.
On another movie set, Blackie sets out to discover who's been causing a series of "accidents" that nearly caused the death of a famous actress.
A farmhand, who was recently released from mental institution, is suspected of trying to murder a farm couple but Blackie, as is his norm, thinks otherwise.
Blackie investigates a series of robberies committed by a young couple who use a motorcycle as their getaway vehicle.
Blackie investigates the murder of a television star who was killed on-camera.
A bank president walks out with a satchel full of money from his institution in Blackie's presence. Or did he?
The police call in Blackie when valuable jewels belonging to a foreign nation are stolen from a guarded safe.
A down and out oil man asks Blackie's help. He wants to recover the proceeds of a ten year old robbery.
Blackie searches the Union Pacific railroad yards to locate a missing heir.
Blackie gets involved in a phony automobile accident as well as stolen naroctics.
Blackie gets caught in the middle of a feud between rival groups of truckers.