This Charlie Chan film is unique in that both Victor Sen Yung and Keye Luke appear in it together. During the climax with the bad guys they handle the rough stuff to bring the culprits to justice and Roland Winters is going to need both of them despite them constantly coming to the wrong conclusions.
Charlie and the boys and chauffeur Mantan Moreland are on a holiday in Mexico when they hear of the disappearance of an old friend of the Chan family, an archeology professor who has disappeared while looking for Aztec treasure, the equivalent of King Tut's tomb in the western hemisphere. They find a colleague of his friend out on the desert, but no sooner do they rescue him than he's murdered. Another murder follows and the the Chan family leads a search party out on the Mexican desert.
This film is more of manhunt than a mystery at least to us because the brains behind all the villainy is revealed just about halfway through the film. Why that was done who knows because it robbed us of any suspense.
That's a pity because for Monogram Charlie Chan feature it's not a bad one.