The Black Diamond Express

Federal agent Alexandra Barnes believes that Catherine Petersen is a serial killer who marries rich men and then murders them for their money. But since Catherine is seemingly a master of disguise and has multiple identities, Alexandra can't prove anything with conventional detective work. With no other option, she goes undercover, pursuing the same man as Catherine, and hoping that Catherine will slip up and reveal her true identity.

When a store clerk organizes a contest to climb the outside of a tall building, circumstances force him to make the perilous climb himself.

A woman wakes up in the middle of the night on board a train, but she can't remember how she got there. Danger and suspense ensue.

An innocent man turns fugitive as he reconstructs events that implicate him for a murder and robbery he did not commit.

When hired killer John Gant rides into Lordsburg, the town's folk become paranoid as each leading citizen has enemies capable of using the services of a professional killer for personal revenge.

Unhappily married Richard Mason concocts a meticulous scheme to kill his shrewish wife so that he'll be free to marry her sister.

When a stranger enters a quiet, country town and is seduced by a sensuous married woman he unwittingly finds himself at the centre of a storm of sexual guilt and murder.

Jane Marple solves the mystery when a local woman is poisoned and a visiting movie star seems to have been the intended victim.

In New York City, an insolent pickpocket, Skip McCoy, inadvertently sets off a chain of events when he targets ex-prostitute Candy and steals her wallet. Unaware that she has been making deliveries of highly classified information to the communists, Candy, who has been trailed by FBI agents for months in hopes of nabbing the spy ringleader, is sent by her ex-boyfriend, Joey, to find Skip and retrieve the valuable microfilm he now holds.

Young socialite Iris Carr befriends an older woman while traveling solo by train. When Iris wakes from a nap, the woman is gone and other passengers claim she never existed.

Wisecracking reporter Carl Kolchak investigates a string of murders in Las Vegas and suspects the culprit is a vampire. His editor thinks he's crazy and the police think he's a nuisance, so Kolchak takes matters into his own hands.

A crooked politician finds himself being accused of murder by a gangster from whom he refused help during a re-election campaign.

Two couples vacationing together in an R.V. from Texas to Colorado are terrorized after they witness a murder during a Satanic ritual.

Newspaper men compete against each other to find a serial killer dubbed "The Lipstick Killer".

In this twisty thriller, a tennis coach at a tropical resort finds himself at the center of a missing persons mystery. Tom teaches tennis during the day and parties at night. When an enigmatic tourist arrives, Tom is unable to shake the feeling he has met her before. Tension and attraction grow, until her husband disappears, and the police suspect Tom.

A man convicted of murdering his wife escapes from prison and works with a woman to try and prove his innocence.

Private eye Phillip Marlowe wants to get out of the detective racket and into crime writing. But when he's called to the office of editor Adrienne Fromsett, it's not to talk about his story ideas — she wants him to locate the missing wife of her boss, Mr. Kingsby. The assignment quickly becomes complicated when bodies start turning up.

A corrupt D.A. with governatorial ambitions is annoyed by an investigative reporter's criticism of his criminal activities and decides to frame the reporter for manslaughter in order to silence him.

Two escaped convicts are on the run in an unnamed Latin American country. But everywhere they go, they are followed and hounded by a menacing black helicopter.

A private detective takes on a case that involves him with three eccentric criminals, a beautiful liar, and their quest for a priceless statuette.

A reformed criminal is blackmailed when three girls are murdered.

The smashed corner of a trunk containing counterfeiting paraphernalia reveals to Helen that there is treachery afoot at Lone Point. Detectives capture two of the trio, but one of them gets away, pursued by Helen, across a high railroad trestle. Seventh of the "Hazards of Helen" Railroad Series.

Red Stanley's band has successfully robbed the express car and the members are making good their escape when they come upon Helen and her girl chum riding in the woods. The girls are set upon but they succeed by desperate riding in making their escape temporarily and, when danger seems near again, are saved by the approaching railroad detectives searching for the Stanley band. A running fight results in the capture of one of the band, but Stanley and his chief aide escape. Under cover of darkness, as Helen is working alone in the desolate station, the two enter and bind and gag her.

"Red" Byrd and his aides succeed in learning that a large treasure is being shipped on a certain freight car under special guard. They overpower the relief operator at Helen's station and tamper with the signals so that the treasure train stops, while the crew runs ahead to investigate, leaving Spencer alone to guard the treasure.

Chilton, a crooked dealer in antiques, decides on a daring scheme to recoup his finances by defrauding the railroad. A car-load of cheap furniture is shipped with a valuation of $40,000 on it. Blanding, the tool of Chilton and his partner, awaits at Lone Point a telegram giving the number of the car.

A pair of crooks steal a valuable package, hold up the crew of a freight engine, and compel the engineer to aid their escape. Learning this, Helen climbs into the cab of a locomotive standing on a siding and takes up the chase.

Billy Warren, timekeeper on the construction job, arouses the enmity of Brent and Easton when he resents their bullying of the other men. Pay day finds the men celebrating in riotous fashion, and Brent in a crazed moment breaks into the station and attacks Helen. Her cries bring Warren, who trounces the bully.

The new superintendent's first order on taking the post eliminates the men whom he terms old, which costs "Pop" Bates his job as Helen's relief operator. His next declaration is that active railroad work is no place for women, and Helen is also dropped from the service. While Helen is breaking the news to Bob Bates, the new superintendent is hustling about the road yard speeding up the work. "Put more snap into your switching," he tells the men. A minute later, while he is making an inspection inside a boxcar with defective air brakes, a switching engine rams the car. The force of the impact, heightened by the recent orders, throws the superintendent to the floor stunned, and starts the car on the down grade. In the few moments it is speeding along the road and there is consternation among the men for a washout down the road means that it is headed to certain destruction.

To prevent a three mile journey around the mountain the telegraph wires at the construction camp have been strung over the precipice from the station on the mountain top. The operator is discharged when the superintendent suspects him of treachery and Helen is transferred to the station. Later, after the former operator has enlisted the aid of crooked brokers to use his knowledge in ruining the value of the road's stock, he receives an opportunity to get revenge on the superintendent.

Through an accomplice the band of conspirators preying on railroads succeed in having the boxcar loaded with auto tires sidetracked at Lone Point instead of being taken on to its rightful destination. They are getting away with the valuable shipment when Helen takes a hand in the affair. While each of the trio carries a load of tires back to the autos which are in a sheltered spot, Helen hurriedly climbs the side of the boxcar and releasing the brakes the car, with its heavy load, starts down grade at great speed.

The story is built around the rivalry of two railroads, and the record run that is to decide the awarding of large mail contracts.

Dick Benton is making a game attempt to start life all over again, after escaping from prison where he was confined for a crime he did not commit. "Peeler" White, who was really guilty, and who aided Benton to escape without telling the reason for his interest, stumbles across the young man who is now an express messenger. "Peeler" threatens to disclose his knowledge unless Benton aids him in a fake hold-up. The young man pretends to be a willing victim, but really warns the railroad detectives and "Peeler" and his companion find themselves in a trap on the train the following day.

Hanging from a rope over the track, the detective seems certain to plunge to death when the oncoming train splits the knot of the rope which has been tied to a rail and slung over the bridge girder. Helen's presence of mind and nerve in swinging out over the river on the other end of the rope and thus balancing the detective until the train has passed prevents the terrible catastrophe. Later, when pursuing the culprits, Helen once more takes her life in her hands by throwing a lasso from the hand car on which they are pursuing the freight over the brake beam, and then crawling hand over hand to the top of the car.

Helen, the telegrapher at Downing Junction, receives word that an engineer has been accidentally shot by a partridge hunter, and the runaway train will collide with the Eastbound Express. Helen jumps onto a nearby standing locomotive, opens it up full throttle, catches up the Express, warns the engineer of the impending danger

Detective Strong is warned that an attempt will be made to free the crooks he is taking to the penitentiary. In spite of his vigilance, the prisoners escape when confederates start a gunfight on the train. Strong and his men scour the countryside for the fugitives.

In the second entry of the popular Hazards of Helen series, Helen, is temporarily assigned as a telegraph operator at Quarry Depot; bad blood springs up between two men who are seeking Helen's favor, but to whom she has remained impartial.

Upon learning that a gang of smugglers are using freight cars to bring Chinamen across the border, the railroad officials order all employees to keep a strict watch for traffic of this nature.

A crooked mine owner attempts to hijack his rival's shipment of ore, but Helen foils his plot by jumping onto the engine and pulling the throttle wide open, eventually exposing the unscrupulous villain.

Sharky, a rival road agent, plots to spoil a trial run to be made on Helen's road that will win a mail contract. He opens a waste valve on the tank of the engine, and, when nearing Lone Point, the water tank runs dry. Helen comes to the rescue by mounting the new gasoline speeder and starting off with the mail for the end of the run.

Jim, determined to ruin a box car brake test, hides inside, removes the flooring, and ruins the brake apparatus. As a result, the box car runs wild, trapping him inside. Before Helen can sidetrack the runaway, it shoots off the track at Elbow curve, overturning as it topples down the embankment. Helen smashes a hole through the side, braves the flames, crawls into the car, rescues Jim and drags him to safety. But her heroism is too late; Jim dies in her arms.