In this lurid melodrama, Tod Slaughter plays a villain who murders the wealthy Sir Percival Glyde in the gold fields of Australia and assumes his identity in order to inherit Glyde's estate in England. On arriving in England, "Sir Percival" schemes to marry an heiress for her money, and, with the connivance of the cunning Dr. Isidor Fosco, embarks on a killing spree of all who suspect him to be an imposter and would get in the way of his plans to stay Lord of the Manor.
The Royal Mounties are called in when one of the armored cars owned by Maxwell, containing a gold shipment, disappears with driver George Hill suspected of trying to get away with the gold. Actually, Maxwell and two henchmen had poured acid on the brake lines, causing the car to crash. Genevieve, daughter of the Mountie chief, suspects Maxwell and Thomas Hatch, president of the bank shipping the gold, but she quickly becomes more trouble than help to Sergeant Renfrew in charge of the investigation. Renfrew and Constable Kelly drive the next shipment but Maxwell plans to make them crash the same way as Hill did. Renfrew steers the vehicle into a hillside and this gives him an idea of what happened to the other car.
When a police officer is murdered, Captain Street looks to Mr. Wong to catch the killer. Prime Suspect: Frank Belden Jr., whose father is a businessman well known for both his success and dishonesty. Mr. Wong faces increasing danger and is nearly executed himself as the investigation develops in treachery and complexity. As Mr. Wong follows the trail of dead bodies, he uncovers a jewel smuggling ring on the San Francisco waterfront and a case much larger than the death of a police officer.
A prison trustee rescues a despondent executioner from a bar-room brawl, and is blamed for the fight by a tabloid reporter who actually started it, and loses parole, becomes embittered, and gets blamed for murder of guard.
After World War I, Armistice Lloyd Hart goes back to practice law, former saloon keeper George Hally turns to bootlegging, and out-of-work Eddie Bartlett becomes a cab driver. Eddie builds a fleet of cabs through delivery of bootleg liquor and hires Lloyd as his lawyer. George becomes Eddie's partner and the rackets flourish until love and rivalry interfere.
A Scotland Yard inspector and his reporter friend arrive on vacation in a small village and are immediately involved in what is claimed to be a murder but the body has disappeared, leaving it to the inspector to find the body, determine the motive and find the killer.
Having once again avoided criminal conviction, Professor Moriarity develops a murderous plan to “finish off” his last major nemesis, Sherlock Holmes, by making him fail to prevent the perfect crime. Does it involve a family curse, the crown jewels of England, or something else…
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.
Dr. Henryk Savaard is a scientist working on experiments to restore life to the dead. When he is unjustly hanged for murder, he is brought back to life by his trusted assistant. Re-animated he turns decidedly nasty and sets about murdering the jury that convicted him.
In the pre-Civil War South, a plantation owner dies and leaves all his possessions, including his slaves, to his young son. While the deceased treated his slaves decently, his corrupt executor abuses them unmercifully, beating them without provocation, and he is planning to sell off the father'e estate--including the slaves--at the earliest opportunity so he and his mistress can steal the money and move to France. The young boy doesn't want to sell his father's estate or break up an of the slave families, and he has to find someone to help him thwart the crooked executor's plans.
Detective Guy Johnson's client, Willie Heywood, is framed for murder. While Guy hides him so he can catch the real killer, both of them are nabbed by the police, tried, convicted and sentenced to jail: Guy for a year with Willie to be executed. On the way to jail, Guy comes across a clue and escapes from the police.
A tough street kid takes the rap for a burglary committed by the son of his foster family and is sent to a boys reformatory, where the inmates are under the thumb of corrupt guards and a brutal prison doctor.