Paul Manderley, eccentric historian, and his wife, descendant of the Borgias, live in an isolated castle-like mansion in the Mojave Desert. When a guest suddenly collapses, Charlie Chan is invited…

A pair of murders in Rio de Janeiro leads the local police to call the famed detective. Charlie is puzzled, at first, when it appears that one of the murderers…

While visiting the circus with his family, Charlie is recruited by the big top’s co-owner to investigate threatening letters that he’s received.