May Whitty as Mme. Rosalie La Grange

Lewis Stone as Inspector Marney

Madge Evans as Nell O'Neill

Thomas Beck as Dick Crosby

Elissa Landi as Helen Trent

Charles Trowbridge as Dr. Mason

Henry Daniell as John Wales

Janet Beecher as Lady Alissia Crosby

Ralph Forbes as Lionel Trent

Heather Thatcher as Mary Eastwood

Holmes Herbert as Roscoe Crosby

Robert Coote as Stanby

Elsa Buchanan as Grace Stanby

Lal Chand Mehra as Professor Feringeea

Matthew Boulton as Commissioner Grimshaw (uncredited)