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 and that someone is out to murder him. Charlie and his "crew" travel to the mine, pretending to be tourists staying at a nearby dude ranch so as not to arouse suspicion, and discover that the owner may well be right--it looks like the mine is being used as a cover for criminal activities, and that someone is indeed out to murder him.
Roland Winters
as Charlie Chan
Wanda McKay
as Evelyn Manning
Mantan Moreland
as Birmingham Brown
Victor Sen Yung
as Tommy Chan (as Victor Sen Young)
Bruce Kellogg
as Talbot Bartlett
Tim Ryan
as Vincent O'Brien / Lt. Mike Ruark
Evelyn Brent
as Sister Teresa
Ralph Dunn
as Jim. Driscoll
Lois Austin
as Mrs. Margaret Driscoll
Forrest Taylor
as Mr. Manning
Lee 'Lasses' White
as Pete
Arthur Berkeley
as Townsman (uncredited)
