Daniel Robin has become mixed up with a band of criminals known as "the 13," and is shot when he refuses to do their bidding. His daughter Ruth, brought home from boarding school, reaches his bedside before he expires. He tells her that she will be given thirteen keys. Instructions will be provided with each key and, if she follows the instructions, she will eventually fully learn of her birthright. Many adventures then follow as Ruth attempts to solve the puzzle of each key and establish her true birthright.

The nefarious Dr. Fu Manchu searches for the keys to the tomb of Genghis Khan, in order to fulfill a...

Irrepressible Helen Rhinelander, the daughter of a railroad president. A dastardly villain, Segrue, ...

Disaster seems imminent when scientists discover that the planet Mongo is about to crash into Earth....

When the unscrupulous Carlos Manning discovers that an old Spanish land grant recently unearthed wil...

A movie serial in 12 chapters: The famous comic strip character is on a mission to protect a secret...

On the American frontier in the last decades of the 19th century, Billie is a female cowboy who figh...

A movie serial in 12 chapters: After gold is discovered in the town of Nugget, the titular band of ...

A beautiful young woman is a daring master thief. She meets the young millionaire Thomas Babbington ...

Eddie King goes up against a villainous circus owner in this action adventure which was directed by ...

A young heiress of an American gun factory is threatened by a masked man after her father was murder...

The mysterious Don Del Oro ("Lord of Gold"), an idol of the Yaqui Indians, plans to take over the go...

A serial in 12 chapters. Tarzan goes to Guatemala to find his lost friend, D'Arnot. On the way he h...

Mr. Lincoln's tremendous physique fits him especially for serial work, where strength and daring are...

Richard Grant, imprisoned in India for a crime he did not commit, escapes and makes his way to Afric...

Professor Campbell's expedition into the hills of Libya obtains a papyrus which might reveal the hid...

A gang of land-grabbers tries to prevent safe passage of the Foster Stage Company through frontier t...

A lady reporter and two college students search for the "Gold Special," a train that disappeared wit...