
El Puma, a Mexican desert guide, escorts an archaeological expedition headed by Professor Lucius Lloyd through the Indian badlands of Mexico. Marian, the professor's niece accompanies the party as only she can translate the Aztec writings in the diary of her father, murdered on a similar expedition six years previous. The professor is murdered by a knife, and the weapon is recognized as the property of El Puma. Magpie, a Federal Investigator, knows that El Puma is really "Lightnin' Bill' Carson, a former federal agent who has been missing since Marian's father was slain. The reluctant Magpie believes that his old pal is guilty. Carson sets out to prove otherwise.
Cast

Tim McCoy
Bill Carson posing as El Puma

Joyce Bryant
Marian Willis

Ben Corbett
Magpie

Ted Adams
Link Benson

Budd Buster
Old Dobie

Dave O'Brien
Dr. Jerry Leonard

Forrest Taylor
Prof. Lucius Lloyd

Reed Howes
Sheriff

John Elliott
Prospector

Kenne Duncan
Henchman

Herman Hack
Henchman
Chick Hannan
Henchman
Carl Mathews
Henchman Hank

Lew Meehan
El Puma Rider

Kansas Moehring
El Puma Rider

Artie Ortego
El Puma Rider Pedro
Tex Palmer
Henchman
Tom Smith
El Puma Rider from Argentina (uncredited)
Frank Wayne
Stagecoach Driver
Wally West
Wagon Driver

Dan White
Henchman
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