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 Wrecker wrecks trains on the L & R Railroad. One of his victims is Larry Baker's father. Baker w...

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

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

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

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

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

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

Rosalind Joy is a constantly imperiled heiress to a fortune in gold. An 18 part adventure serial

Adventures of an American Secret Service-girl in search of an important German secret during the war...

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

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

A mad scientist named Dr. Satan plots to steal key pieces of technology to enable him to build an ar...

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

The heirs of Anton Benson are searching Bensonhurst for hidden gold; they are joined by a reporter, ...

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

The Timber Queen follows Ruth Rowland as the inheritor of a wealthy timber business who tries to st...

In this 12 Chapter serial the UN enlists trader Tom Rogers and Vivian Wells, to lead the effort to p...

Japanese spies attempt to subvert America's war effort; G-Men attempt to thwart their plot.

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