King investigates a man's claim to have invented an inexpensive way to manufacture synthetic diamonds.

King investigates a Burmese man who is sponsoring a beauty contest in Miami Beach.

When a priceless diamond is stolen, two juvenile delinquents are King's only leads to locating the stolen gem.

Two hoodlums pursue a burned-out musician who found a cache of stolen gems.

A crook salts a worthless piece of desert real estate with diamonds and tries to con greedy investors into buying the land.

A successful jewel thief moves to the United States and brings along a pretty confederate to distract King and O'Brien.

A criminal is released from prison after serving a fifteen year sentence.

A clown supplements his meager income with petty thefts.

While touring New York City, a group of West Point cadets get mixed up in a diamond robbery.

A member of a criminal syndicate develops a unique method to steal diamond jewelry.

King and O'Brien seeks the help of a hip, young British singer to trap a criminal gang.

A employee uses his employer's trust to steal a small fortune in industrial diamonds.

An employee concocts a scheme to steal jewels from his elderly female employer.

A friend of King's joins the criminal syndicate controlling criminal activity in the diamond industry.

King helps three men escape from the Congo when a revolt in the diamond fields breaks out.

Many years after World War II, two former servicemen have a falling out over the German crown jewels that they stole during the waning days of World War II. One man, a local politician wants to return the gems, but the other wants to sell the diamonds to the highest bidder. With the help of a beautiful but shifty French smuggler, King and Casey attempt to recover the gems before they disappear.

King tries to learn which of four freighters is carrying a cache of uncut diamonds.

Diamond smugglers use an unsuspecting magician to carry illegal gems from one location to another.

King's ex-girlfriend, a jewel thief, considers returning to a life of crime.

While on an airplane, a courier is robbed of a fortune in diamonds. He raises an alarm, not realizing the thief has tossed the briefcase full of gems from the plane to his awaiting accomplice on the ground.

Suspecting his wife is having an affair with one of his employees, a diamond dealer asks the young man to deliver a valuable gem and then tells the police that the diamond has been stolen.

During the confusion following a train wreck, a diamond thief makes a bid to steal diamonds from a courier's possession.

King and O'Brien recover a cache of stolen gems, but the crooks plan to strike regain their ill-gotten goods.

King and O'Brien travel to the Orient in pursuit of a napkin ring encrusted with jewels.

King learns that the chief of Havana's police is stealing diamonds from the victims of his firing squads.

Johnny King's efforts to end diamond smuggling are so effective that the crooks decide to eliminate him.

King poses as a oil tycoon to investigate a tip about a new gang of diamond smugglers.

King suspects the owner of a tramp steamer may be smuggling diamonds in crates of tuna.

Diamond thieves in four different countries stage successful prison breaks.

The Illegal Diamond Buyers, a criminal cartel, plot to cause a massive drop in the price of diamonds on the world market.

In order to trap a gang of South African diamond smugglers, Casey agrees to pose as one of the criminals.

A beautiful woman and her henchman try to smuggle a sack of diamonds out of the country.

King must guard a cache of diamonds.

Johnny suspect an old army friend is behind the commando style raid on the London Diamond Exchange.

A beautiful blonde plays off one member of a gang of diamond thieves against another in an attempt to steal two million dollars in gems for herself.