An undercover U.S. agent in California adopts the persona of the "Masked Stranger" to protect wealthy Spanish families from corrupt land-thieves. When a ruthless land-grabber named Owens assassinates landowner Don Carlos for his gold-rich estate, Carlos’s sister, Rosa, blames the masked agent for the tragedy. Unable to reveal his identity, the agent must maintain his disguise to defeat Owens, clear his name, and reclaim Rosa's stolen heritage.

Tim McCoy
as The Masked Stranger

Roy D'Arcy
as Owens

Polly Moran
as Inez

Richard Neill
as Don Carlos del Valle

J. Gordon Russell
as Wells

Sylvia Beecher
as Rosa del Valle