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Conrad Nagel
Richard Crosby

Leila Hyams
Helen 'Nellie' O'Neill

Margaret Wycherly
Madame Rosalie La Grange

Helene Millard
Mary Eastwood

Holmes Herbert
Sir Roscoe Crosby

Mary Forbes
Lady Alice Crosby

Bela Lugosi
Inspector Delzante

Charles Quatermaine
Dr. Philip Mason

Moon Carroll
Helen Trent

Cyril Chadwick
Brandon Trent

John Davidson
Edward 'Ned' Wales

Bertram Johns
Howard Standish

Gretchen Holland
Grace Standish

Frank Leigh
Professor Feringeea

Clarence Geldart
Commissioner Grimshaw

Lal Chand Mehra
Chotee