A valuable gem from India is stolen in an old, dark mansion, and it is up to Scotland Yard Inspector Cuff (Charles Irwin) to discover the culprit among the many suspects present in the house. Cast: - David Manners as Franklyn Blake - Phyllis Barry as Ann Verinder (misspelled Anne in opening credits) - Gustav von Seyffertitz as Carl Von Lucker - Jameson Thomas as Godfrey Ablewhite - Herbert Bunston as Sir John Verinder - Charles Irwin as Inspector Cuff - Elspeth Dudgeon as Betteredge, Housekeeper - John Davidson as Yandoo - Claude King as Sir Basil Wynard - Olaf Hytten as Dr. Ezra Jennings - Evalyn Bostock as Roseanna Spearman, Maid - Fred Walton as Henry the Butler - John Power as The Driver - Harold Entwistle as Sutter - A.C. Henderson as Robbin Runtime: 46 minutes