The elderly O'Hara, owner of a fortune in emeralds, offers half of his estate to whoever manages to get him out of jail. The adventurer Don Casey arrives in the town of Guaynas, ruled by the tyrant Villarde, to fulfill that wish.

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Main Cast: John Richardson, Fernando Sancho, Eduardo Fajardo, Gloria Milland, Xan das Bolas, José María Caffarel, Mia Genberg, Evi Marandi, Luis Barboo, Patrizia Giammei

Director: Joaquín Romero Marchent

Writers: Luis Gaspar, Joaquín Romero Marchent, Lewis E. Ciannelli

Editors: Giancarlo Cappelli, Mercedes Alonso, Mario Morra

Cinematographer: Federico G. Larraya

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