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A gold mine in Arizona, that was formerly losing a lot of money, suddenly turns into a veritable money-making machine. However, the owner, instead of being happy about his now profitable business, insists to Charlie that something is fishy ...

Il detective privato di origine cinese Charlie Chan indaga sul mistero di una miniera abbandonata che, all'improvviso, diventa ricca di un filone aurifero. Come può essere successo un tale fenomeno "innaturale"? Chi può avere interesse a ...