| Glenn Ford | ... | Al Colby | |
| Diana Lynn | ... | Julie Barnes | |
| Patricia Medina | ... | Anna Luz | |
| Francis L. Sullivan | ... | Thomas Berrien | |
| Sean McClory | ... | Jefferson | |
| Eduardo Noriega | ... | Raul Cornejo | |
| Julio Villarreal | ... | Ulbaldo Navarro (as Julio Villareal) | |
| Charles Rooner | ... | Captain Bergman | |
| Douglass Dumbrille | ... | Consul (as Douglas Dumbrille) | |
| rest of cast listed alphabetically: | |||
| Mona Barrie | ... | Tourist (uncredited) | |
| Victorio Blanco | ... | Waiter (uncredited) | |
| Juan García | ... | Bartender (uncredited) | |
| Margarito Luna | ... | Tacho (uncredited) | |
| Carlos Múzquiz | ... | Museum curator (uncredited) | |
| Manuel Vergara 'Manver' | ... | Man playing cards (uncredited) | |
Directed by | |||
| John Farrow | |||
Writing credits | ||
| Jonathan Latimer | (screen play) | |
| David Dodge | (based on the novel by) | |
Produced by | |||
| Robert Fellows | .... | producer | |
| John Wayne | .... | producer (uncredited) | |
Original Music by | |||
| Antonio Díaz Conde | |||
| Hugo Friedhofer | (uncredited) | ||
Cinematography by | |||
| Jack Draper | |||
Film Editing by | |||
| Harry Marker | |||
Art Direction by | |||
| Alfred Ybarra | (as Al Ybarra) | ||
Makeup Department | |||
| Dave Grayson | .... | makeup artist (as David Grayson) | |
Production Management | |||
| Nate H. Edwards | .... | production manager | |
Second Unit Director or Assistant Director | |||
| Andrew V. McLaglen | .... | assistant director | |
Sound Department | |||
| James L. Fields | .... | sound director | |
| Galdino R. Samperio | .... | sound re-recordist (as Galdino Samperio) | |
| Manuel Topete | .... | dialogue recordist (as Manuel Topete Blake) | |
Music Department | |||
| Antonio Díaz Conde | .... | conductor | |
| Manuel Topete | .... | music recordist (as Manuel Topete Blake) | |
| Arthur Lange | .... | composer: additional music (uncredited) | |
| Robert Wiley Miller | .... | composer: additional music (uncredited) | |
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| Marie Galante | Sea Tiger | Custer's Last Stand | Mark of the Spur | The Treasure of the Sierra Madre |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Action section | IMDb USA section |
Not much of David Dodge's novel remains in this film version, other than the names of some of the characters and the basic plot. American insurance investigator Al Colby is hired to smuggle a package out of Havana and into Oaxaca, Mexico. When the man who hired him is murdered aboard ship, Colby decides to find out what he is carrying and why it is worth killing for. Unscrupulous antiquities dealers, disgraced archaeologists, and desperate women all clash in a search for buried Zapotecan treasure. Glenn Ford is serviceable as Al Colby, but the plot is murky, the characters are under-developed, and the location is inexplicably changed from Peru to Mexico. Although it is long out-of-print, copies of the book are still relatively easy to find (unlike prints of this film, which is still tied up in Wayne estate litigation), and reading the book is a much better use of one's time.