A film projectionist longs to be a detective, and puts his meager skills to work when he is framed by a rival for stealing his girlfriend's father's pocketwatch.

At a party thrown at the Metcalf estate, the Marquise D'Irancy's Sultana diamond disappears when the lights go out during a power failure. Suspected of the crime is William Kirkland, the wastrel son of the wealthy Kirkland family, but William's sister Diana comes to his defense. Aiding her in the investigation is Clamp, a wandering peddler.

A nervous and unsettling young boy takes a mysterious old suitcase across London... to a twisted and surreal conclusion.

London. A mysterious serial killer brutally murders young blond women by stalking them in the night fog. One foggy, sinister night, a young man who claims his name is Jonathan Drew arrives at the guest house run by the Bunting family and rents a room.

A world-famous pianist loses both hands in an accident. When new hands are grafted on, he is horrified to learn they once belonged to a murderer.

The final days before Weston mysteriously snaps and goes insane.

John Stonehouse (William Russell) checks into a hotel, intending to commit suicide. But instead he winds up helping a girl, Gilberte Bonheur (Fritzi Brunette), out of a jam. He finds her bending over a man who she has apparently killed, and since he's about to kill himself anyway, he offers to assume the blame. Throw a valuable emerald into the works, and the fact that the dead man suddenly comes back to life, and Stonehouse -- not to mention the audience -- becomes thoroughly befuddled by it all. Everything clears up, however, when Gilberte gives him a theater ticket -- it turns out that everything he went through was the plot to a stage play, enacted in real life by the actors. The critics roasted the play, saying it wasn't true to life, and this was their proof that the situations really could happen. Gilberte retires from acting when Stonehouse proposes.

Sherlock Holmes is a master at solving the most impenetrable mysteries, but he has his work cut out for him on his latest case. As the famed detective investigates an alleged theft, he’s brought face to face with his most devious adversary yet — Professor Moriarty.

The abandoned Balfour House, the owner of which was found dead five years earlier, comes back to life with the arrival of two suspicious sinister-looking tenants. This film was lost in the 1965 MGM vault fire; only a few stills exist.

Audacious Jeanne works in a book bindery, is given a diary written by Thomas Dodd to bind. The diary portrays Dodd as a scoundrel who fathered a girl by a woman he never married, and Dodd's family as a nest of vipers. Jeanne decides it is her duty to save this corrupt family and presents herself to Dodd as his illegitimate daughter. In fact, Dodd is a meek old man whose scandalous diary was pure fantasy, and the only hostile member of the family is Dodd's greedy brother Jerry, who was the only sympathetic character in Dodd's diary. Jeanne falls in love with Dodd's nephew Kent, though she dutifully urges him to marry Hazel Jenkins, a woman whom Jeanne believes Kent has wronged. A lost film.

George Walters is a youth who is dominated by Bleary, a heartless bully, who forces him to pose as the son of millionaire George Warring, kidnapped as a baby. The missing son had a twin brother who had recently died, but a painting of the shadow of the late son is on one wall. Walters' shadow matches this painting perfectly, establishing him as the missing son to the Warring family. Walters falls in love with Warring's daughter Lucia and finds that the family attorney Glaxton is slowly poisoning the old man.

A young woman consents to a bad marriage to an unscrupulous man in order to save her father from ruin. When her marriage is disrupted by a murder, three different people confess to it.