Drummond's wedding with Phyllis is interrupted when the inspector guarding their gifts is killed. He tries to trace the killers and uncovers the mystery of diamond counterfeiters.
Colonel Neilson
John Barrymore
Captain Hugh 'Bulldog' Drummond
John Howard
Phyllis Clavering
Louise Campbell
Algy Longworth
Reginald Denny
Tenny
E. E. Clive
Dr. Botulian
Porter Hall
Aunt Blanche
Elizabeth Patterson
Gwen Longworth
Nydia Westman
Prof. Bernard Goodman
Halliwell Hobbes
Sir Raymond Blantyre
Matthew Boulton
Mrs. Weevens
Zeffie Tilbury
Constable McThane
David Clyde
Constable Sacker
Clyde Cook
Roberts
Austin Fairman
Anthony Greer
Michael Brooke
Paulette
Georgette Rhodes
Raoul
Gregory Gaye
Mechanic
Jimmy Aubrey
Constable Announcer
Frank Baker
Villager
Frank Benson
Botulian's Driver
William Haade
Bus Garage Man
Forrester Harvey
Footman
Andre Marsaudon
Hoffman
Torben Meyer
Train Official
Albert Petit
Radio Dispatcher
Albert Pollet
Doctor
John Sutton
Spinster
Maude Fealy
Spinster
Margaret Fealy
Messenger
Peter Bronte
Messenger
Charles De Ravenne
Sergeant
James P. Burtis
Constable
Evan Thomas
Constable
David Dunbar
Constable
Douglas Gordon
First Expressman
Pat X. Kerry
Second Expressman
David Thursby