Charlie Chan, with son Jimmy on a week's pass from the Army, takes up a request for help at a castle-home, miles from anywhere in the American desert south-west and inhabited by an eccentric, reclusive historian and his wife, a descendant of Lucrezia Borgia. Once there, he finds the request's legitimacy denied by all who are present, but still necessary as one houseguest has already been murdered, the other guests are at each other's throat, and the Borgia-related chatelain is suspected...
Sidney Toler
as Charlie Chan
Victor Sen Yung
as Jimmy Chan
Lenita Lane
as Lucy Borgia Manderley
Douglass Dumbrille
as Paul Manderley
Steven Geray
as Dr. Retling
Edmund MacDonald
as Walter Hartford
Arleen Whelan
as Brenda Hartford
Ethel Griffies
as Mme. Saturnia, aka Lizzie
Henry Daniell
as Watson King
Richard Derr
as Carl Detheridge
Lucien Littlefield
as Prof. Gleason
Milton Parsons
as Arthur Fletcher
