Harold McGrath

Insane with the desire to avenge his daughter's death, Dr. Boris Karlov plots a sinister scheme of revenge against the family he holds responsible. Corrupt and cowardly Prince Gregor Petrov had given Karlov's daughter a mysterious necklace known as The Drums of Jeopardy, which is rumored to have deadly powers. The scientist uses the necklace and its jewels as messengers of death when he begins to hunt down members of the doomed family. (Oldies.com)

An American who has lived much of his life outside the country returns to Arizona for the first time in years and encounters villainy. (imdb)

The daughter of an adventurer in India is kidnapped by a native king, whom she is forced to marry. She has several adventures battling natives and wild animals.

This twenty-three episode serial told the story of a secret society called The Black Hundred and its attempts to gain control of a lost million dollars. (imdb)

A wealthy young man disguises himself as a gardener to be near the woman he secretly loves. He discovers that the butler is an enemy spy who plans to steal military secrets, and has to find a way to stop him.