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.
Franklyn Farnum
as Silent Joe
Mary Anderson
as Lou - Durant's Daughter
Duke R. Lee
as Steve Durant
Harry Lonsdale
as Grandon
Vester Pegg
as Rankin
Bud Osborne
as Skip Brandt
L.M. Wells
as William Stillman
William Orlamond
as The Shadow
Pedro León
as Bully Drake
