When Harlan Carr inherited his Uncle Ebenezer's "Jack-O Lantern" house and too his bride there to live, he found himself the unwilling host of a score of hungry relatives within a week. Soon, strange things began to happen. A black cat made the house his headquarters, unexplained sounds could be heard and a shadowy figure floated through the halls at night.
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.
The Man With The White Mask
Winthrop Clavering a mystery writer, is continually ridiculed for the fiction of the crimes he depicts, so he decides to solve a case himself. To that end, he determines to find the slayer of Pedro Alvarez, who whispered before dying that his assailant was a woman. At the City Refuge for Homeless Girls, Clavering obtains the assistance of Margaret Holt, the sister of Victor Holt, the district attorney. Margaret, it is revealed, was abducted by Juanita, a member of a gang of white slavers led by Alvarez. After escaping from a brothel, Margaret became Alvarez' stenographer, hoping to gather secret information on his gang. While searching for evidence, Margaret was surprised by Alvarez, whom she killed. Finally, Clavering captures the gang, clears Margaret, and encourages her romance with cub reporter Jack Howell. This film is presumably lost.
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.
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.
After returning home to his long-estranged mother upon a request from her deathbed, a man raised by his parents in an orphanage has to confront the childhood memories that have long haunted him.
A magician seeks vengeance upon the man who paralyzed him and the illegitimate daughter he sired with the magician's wife.
A masked criminal who dresses like a giant bat terrorizes the guests at an old house rented by a mystery writer.
A general store clerk and aspiring detective investigates a mysterious disappearance that took place quite close to an empty insane asylum.
Chaney plays two roles: mad scientist Arthur Lamb and Lamb's "experiment", known only as the Ape Man. This hideous creature was the result of Lamb's attempts to transplant animal glands into human beings. A lost film.
Wealthy spinster, Rachel Innes rents a country house with her niece and nephew for the summer, only for a series of strange occurrences and a murder at the house's circular staircase to lead to shocking revelations about the home's owner and the family secrets within the house.
Young London realtor Leonard Tavernake becomes involved with two sisters, one good and one evil, which leads to much melodrama but things work out in the end.
A woman's cheating husband is murdered at their country estate, and suspicion immediately falls on her.
A demon, a reaper, and the ghost of a prostitute read gothic short stories and act them out.
A romantic rivalry among members of a secret society becomes even more tense when one of the men is assigned to carry out an assassination.
In Dijon, Inspector Hanaud investigates Betty Harlowe after her uncle, Boris Waberski, accuses her of poisoning her wealthy aunt for an inheritance. While an initial autopsy finds nothing, Hanaud discovers the use of Strophanthus Hispidus—a rare, undetectable poison applied via an antique arrow. Amidst a flurry of "poison pen" letters and deception, Hanaud proves the murder occurred despite the lack of conventional medical evidence.
Business partners Bradley and Collier both love Mary. Bradley leads Collier to believe he is engaged to her so Collier prepares to head West when Lola, the young girl Bradley had seduced and abandoned, appears at the office and begs Bradley for help. He spurns her slipping out of the office and making it appear that Collier is the lout. Mary with that perception marries Bradley only to discover by Lola’s deathbed confession that she has been deceived. Tony, Lola's father, crazed by his daughter's death, comes to Bradley's office and the next day Bradley is found dead. When Tony is arrested Collier steps forward to say he confronted Bradley and as they struggled the revolver Bradley drew went off, killing him. Tony is freed and Collier and Mary marry.
Holmes and Watson match wits with an opera star intent on blackmailing a king.