As described in a film magazine, Warren Summers (Peil) and his wife (Lamb) along with their pretty relative Meta Cooper (Rich) go to the town of Green Water to purchase the Bumble Bee mine, which is owned by Duke Fairley (Hart) and Dad Petzel (Berrell). While Duke is out of town Dad sells the mine, receiving worthless stock for it. Duke then heads east to find the swindlers and to see Meta again.
A financially-troubled Kentucky horseracing family is threatened with disgrace when the jockey brother agrees to throw a race in San Francisco and then gets mixed in a murder investigation. Meanwhile, his sister plans to enter her horse in the Kentucky Derby. Her brother escapes from jail in order to ride it to victory.
When William Wadsworth is murdered, his adopted son Raymond is arrested, found guilty on the basis of circumstantial fingerprint evidencde, and sentenced to death. His best friend, Peter, proposes to Raymond's sweetheart, Alicia, who, in desperation, agrees to marry him if he can find new evidence to prove Raymond's innocence. When the family's doctor is murdered, and Raymond's fingerprints are found at the crime scene, it is revealed that Peter is a madman, and in order to frame Raymond for the murders had taken casts of Raymond's fingerprints.
Jeweller Edwin Hobbett is targeted by confidence tricksters pretending to be connected with the exiled Russian Royal Family. He manages to turn the tables on them, and, after collecting the reward for their arrest, uses the money to buy silver bracelets for his wife to celebrate their wedding anniversary.
Baroness Orsani makes a bet that she can steal a friend's valuable diamond necklace just to prove that she can, intending to return it afterwards. Before she can accomplish this, a gang of international jewel thieves led by a man posing as a police inspector, steal it first.
French policeman Inspector Duval is brought to London to help his British colleagues crack a case. The investigation concerns the murder of a socialite during a jewel theft. However, it turns out Inspector Duval has ulterior motives.
Peter, a rich young man-about-town, poses as a poor man and is taken by ex-convict Soapy McGill to a hostel where he is given a job by the manager, Anne. Peter falls for Anne and stays at the hostel doing any job available. Soapy believes Peter is a safe-cracker, and after boasting about him to a gang, Peter is abducted by the gang to crack a safe.
Jack Banning, a member of the Secret Service, receives a mission to disrupt the operations of a gang involved in smuggling silk. Adopting the guise of a motorcycle officer, Banning monitors their activities during the day, and by night, he assumes the persona of "Strongarm Samson," a criminal. Along the way, he becomes enamored with Marion Macy, the daughter of a banker, who is also being pursued by Courtney, the leader of the smuggling ring.
Brenda Mason, an American pleasure-seeking society girl, visits a fashionable gambling club with Dick Porter, a moneyed layabout. They drink heavily and Brenda falls into a drunken sleep. Porter accuses Captain Merrow, owner of the club, of running a crooked roulette game.