The Hope Diamond Mystery

Grace Darmond

Mary Hilton / Bibi

Harry Carter

Sidney Atherton / Nang Fu / Ghung

George Chesebro

John Gregge / Jean-Baptiste Tavanier

Boris Karloff

Priest of Kama-Sita / Dakar

Carmen Phillips

Wanda Atherton / Miza

Harry Archer

Johnson

Arthur Clayton

Lord Francis Hale (as Captain C. Clayton)

Ethel Shannon

Lady Francis Hale

William Buckley

Reginald Travers (aka Putnam Bradley Stone)

Frank M. Seki

Saki