May Whitty

as Mrs O'Neill aka Madame Rosalie la Grange

Madge Evans

as Helen "Nell" O'Neill

Lewis Stone

as Inspector Marney

Elissa Landi

as Helen Trent

Thomas Beck

as Dick Crosby

Henry Daniell

as John Wales

Janet Beecher

as Lady Alicia Crosby

Ralph Forbes

as Major Lionel Trent