A Mysterious Mystery

Allayne Norman's husband Bruce is a gambler and drunkard who kills her artist cousin in an argument. Bruce flees the studio with Allayne and their son, and places his identifying documents in the pockets of an amnesiac man. To avoid the consequences of his actions, Allayne identifies the man as her husband. When Bruce returns, he tries to kill the man but is shot instead. The man regains his memory and is cleared of wrongdoing.

A murderer strikes at a secret gathering of top law enforcement agents, brought together by a millionaire seeking their endorsement of his candidate for governor.

After old Trowbridge is mysteriously murdered, his nephew, Kane Langdon, is accused of the crime. Trowbridge's adopted daughter Alice makes every effort to prove Kane's innocence, but to no avail. When Kane escapes from the clutches of the law, Alice works with him to investigate the crime. They soon discover that Judge Hoyt, a great friend of Trowbridge and an ardent admirer of Alice, killed Trowbridge after forging the old man's will to read that Alice would only inherit his fortune if she married the judge. The judge, confronted with the accusation, becomes so unnerved that he confesses to the crime, and all ends happily with Alice in Kane's arms.

Bored by her hardworking husband, Tess goes to an illegal gambling den with a former suitor, Arthur Sinclair. The den is robbed and subsequently raided by police. Tess loses her rings and lies to her husband about her whereabouts. Her lies are exposed when the rings are found by the police. While trying to manage the fallout, she writes a compromising letter that is intercepted and used to blackmail her for $15,000. After being embroiled in further dangerous, fraudulent activity, her innocence regarding the robbery and associated crimes is established through the confession of a criminal named Peter Vanetti. 

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.

Mystery film in the detective Stuart Webbs series.

An operator at a mobile pager company has her life turned upside down by a seemingly senseless abduction. Currently considered to be a lost film (never released to the general public, after its theatrical premiere in Puerto Rico).

Holmes goes on the trail of a Rembrandt painting, stolen by a drug-addicted artist.

This silent mystery is considered a lost film.

A film buff's obsession with an elusive, possibly nonexistent film spirals into a dangerous descent, blurring the line between reality and madness.

Living quietly under the assumed name Paul Sernine, reformed gentleman crook Arsene Lupin is summoned to protect his invalid, wealthy friend Henry Forbes.

Much-married and once successful writer Henry T. Aythecliff, now heavily in debt, summons his three ex-wives to his mansion, planning to extort a sizable amount of money from each. When he is discovered dead, clues indicate that each of his four wives had motive and opportunity to murder him, and a young detective must sift through some ingeniously devised evidence.

A murder is committed at a country mansion. All the guests present at the estate fall under immediate suspicion as investigators attempt to solve the mystery before they strike again.

A multimillionaire is murdered, and his will leaves all his money to a beautiful young blonde. The murdered man's son thinks something is fishy, and a homicide cop sets out to find out who was behind the man's death. Complications ensue.

After Outlaw Slippery Joe robs a miner and his daughter, a sheriff pursues him. While on the outlaw’s trail, the sheriff finds the miner's horse, abandoned by the outlaw, and notices the resemblance between Slippery Joe and Mr. Bond, a man he had encountered earlier who was searching for his twin brother. The miner and his daughter arrive at the ranger's cabin, recognizing Bond as the robber.

Norma, a dancer, receives many presents from admirers. Among them she finds a peculiar looking box, out of which spring several poisonous snakes. Nelson, a detective, is called upon to solve the mystery.

After a popular singer dies in a mysterious auto accident, her fiancee assembles all those who were to attend there wedding, hoping to find her killer.

A young nurse reports to work in a hospital's psychiatric wing and gets involved in a series of mysterious deaths.

The wife of a TV executive thinks she might have committed a murder and is tormented by a stalker while locked inside an empty TV station.

A mystery writer's son is being held for $1 million ransom.