The Thirteenth Chair

Mrs O'Neill aka Madame Rosalie la Grange

Helen "Nell" O'Neill

Inspector Marney

Helen Trent

Dick Crosby

John Wales

Lady Alicia Crosby

Major Lionel Trent

Governor Sir Roscoe Crosby

Mary Eastwood

Dr Mason

Stanby

Grace Stanby

Professor Feringeea

Constable

Chotee

Grimshaw (uncredited)