When her father goes broke in the stock market, Jane Lee is forced to leave her prestigious boarding school. Glad-handing John Brock, an old friend of Jane's father, arranges for the girl to be hired as his stenographer. But Brock's lecherous ulterior motives become obvious when he locks Jane in the office and tries to rape her. When she manages to escape his advances, Brock vengefully frames the girl on a robbery charge.
Old Silas Blackburn, a wealthy recluse, lives alone with his butler and his ward Katherine. One night, Katherine discovers Silas murdered in the room where three generations of Blackburns have mysteriously died. Silas' grandson Robert, whom Katherine loves, comes to visit the next day, suffering from amnesia.
Most of the scenes are laid in a parrot-and-monkey country in South America, a land where "it is always after dinner." The Llano Kid, a Texas bad man, flees there from justice. The consul persuades him to play the long-lost son of a Castilian family, and tattoos a coat of arms on the back of the Kid's hand to make the deception complete. The Kid is taken into the household, trusted and loved by the gladdened mother. For the first time he has a home. The romance develops. And when the time comes to rob and flee he has too much manhood to break the loving mother's heart. The surprise comes when it is revealed that the man the Kid killed in Texas was the real son.
A boxer saves a girl from a noble kidnapper.
A baby is left on the Brinbecombes' yacht while they are sailing up the Hudson River, and they adopt him and name him Everett. They are neighbors of Governor Floyd Vandecarm whose twin children, Floyd Jr. and Fledra, were kidnapped in early infancy. Their abductor was Lon Cronk, a man sent to prison by Vandecar when the latter was a district attorney of the county. The twins grow up in Cronk's shack as "Flea" and "Flukey." Despite her rough surroundings Fledra/Flea grows into lovely young womanhood and she and her brother run away from Cronk's cruelty. They reach Tarrytown and peer into the lighted windows of the home of siblings Horace and Anne Shellington. Anne brings the two young vagrants into the house and ultimately adopts them. But Cronk, aided by Everett, wages a long, evil campaign to regain possession of the children.
An actress poses as an heiress who died, and dies fighting blackmailing detectives in a burning house.
Penniless aristocrat Yvonne Dupré ekes out a living selling her paintings to a crooked dealer, Leon Naisson, who passes them off as other more famous artists. Leon confides to his unscrupulous model Romildo, that he is attracted to Yvonne. Romildo drugs his lover, fiery Apache dancer Juliette who closely resembles Yvonne, then tries to extort money from Leon to have his way with her. Leon discovers the duplicity but convinces the artist's sweetheart, Dick Gray, that she has been unfaithful. As police close in on Leon, he frames Yvonne by planting forged paintings in her studio. Following Yvonne's arrest, Juliette is informed by her foster sister that she was stolen by gypsies as a child and is actually Yvonne's twin sister. Juliette exposes Leon's operation to the police, reuniting Yvonne and Dick.
On the trail of counterfeiters Detective Craig is on their trail. Suspicion falls on James Dalton who passes bad money through unsuspecting "fences." Dalton plants bad bills on young Bob Brierly and when it is detected Dalton, as usual, escapes while the innocent Bob is caught and convicted. Upon his release Bob meets Mae Edwards who gets him a job in her bank. When Dalton comes to the bank to case it for a robbery he runs into Bob and tries to recruit him as an accomplice. Bob, who has married Mae, refuses. Dalton causes him to lose his position and because of Dalton’s persistent efforts forces Bob to join the crook. Craig, shadowing Dalton, knows Bob is taking part against his will. Craig foils the robbery and after a motorboat chase Dalton is captured and exonerates Bob.
To help secret serviceman Bill Parsons in pursuit of the thieving Benson gang wealthy criminologist Henry Avery sends his assistant Blinky to cover the waterfront while he attends a reception at the home of Mrs. Cornelius Westervelt. At the soiree he meets gang member Alice Carter while also discover the gang’s cache hidden there. Captured Parsons is saved by Blinky, and the pair foil the gang’s attempt to rob Mrs. Westervelt and her guests.
Jim Crosby, the product of a broken home, becomes a gangster and goes to prison. Meanwhile, Ann Payton, an heiress, converts a saloon into a mission. She is engaged to her father's secretary, Temple Vaughn, a gambler. Jim is released from prison and seeks shelter at the mission. Temple becomes indebted to gambler Phil Johnson and is forced to arrange a crooked poker game involving some of his wealthy friends. Jim overhears the plot and, realizing that Temple is Ann's fiancé, robs the poker game and puts a check Temple forged into Temple's own pocket.
Brothers James and Allen Mornington are both addicted to cocaine and both believe that their addiction is caused by a hereditary failing. James rises to the position of judge, but when Allen is brought into his court on drug charges, James resigns. The two brothers, along with James's daughter, Hilda, then retire to the country to fight their desire for drugs.
Millionaire Joshua Barker insists that his daughter, Faith, must marry Phil Langhorne, a man that neither likes, and Faith is in love with and eager to marry her childhood sweetheart, John Temple.
Wade Hildreth is sent to New York from London to receive a diamond necklace for Lady Gwendolyn from the jeweler Arabin. A gang of crooks led by Pete Fielding, known as "The Shadow," plans to keep Hildreth from going to Arabin's until they have robbed the store. Actress Morn Light, whom the Shadow loves, agrees to entice Hildreth to her apartment to be imprisoned. When she warns Hildreth because she wants to avenge her father's death, which was caused by the Shadow, the Shadow overhears and captures them both.
Employed as secretary to Howard Abele, Marjorie Abbott attracts the attention of Sydney, her employer's son, who falls desperately in love with her. Mr. Abele is strenuously opposed to their marriage and he quarrels with his son. Marjorie has a half-brother, Dave, who is of an inventive turn of mind.
John Hampstead gives up his career as an actor and his actress sweetheart, Marian Dounay, to become a minister in a western town. Marian appears, and failing to win him back she tries to ruin his reputation. Hampstead is accused of stealing some jewelry though actually he is protecting the scapegrace brother of his current sweetheart, Bessie.
A reporter and a detective team up to solve the murder of a nightclub singer who had been involved in a divorce scandal.
A man receives a mysterious email appearing to be from his wife, who was murdered years earlier. As he frantically tries to find out whether she's alive, he finds himself being implicated in her death.
Holmes and Watson match wits with an opera star intent on blackmailing a king.
When French criminal Corey gets released from prison, he resolves to never return. He is quickly pulled back into the underworld, however, after a chance encounter with escaped murderer Vogel. Along with former policeman and current alcoholic Jansen, they plot an intricate jewel heist. All the while, quirky Police Commissioner Mattei, who was the one to lose custody of Vogel, is determined to find him.
Tracy Fleming is a widowed police officer, with a young son, who has risen to the role of plainclothes operative. After six women have been raped and killed, Fleming agrees to go undercover in an effort to make herself a target for the killer. The climax places her in a life-and-death struggle with the killer.