A 15-chapter Western serial. The serial involves the mystery of the murder of William Stillman (Wells) and the finding of the heir to his fortune. Silent Joe (Farnum) arrives in an effort to discover the murderer and prove that he is the true heir. He and the heroine Lou (Anderson) have their adventures in the mountainous terrain with its "vanishing trails." They are aided by The Shadow (Orlamond), a demented scientist with his trained dog, and several remarkable, death-dealing inventions.

Cast

Franklyn Farnum

Silent Joe

Mary Anderson

Lou - Durant's Daughter

Duke R. Lee

Steve Durant

Harry Lonsdale

Grandon

Bud Osborne

Skip Brandt

William Orlamond

The Shadow

Vester Pegg

Rankin

L.M. Wells

William Stillman

Pedro León

Bully Drake