The Ace of Scotland Yard

Crauford Kent

Inspector Angus Blake

Florence Allen

Lady Diana Blanton

Albert Prisco

Prince Darius (as Albert Priscoe)

Monte Montague

Jarvis

Grace Cunard

Mary Duveen- aka Queen of Diamonds

Herbert Prior

Lord Blanton

Ray Taylor

Réalisation

Harold M. Atkinson

Scenario Writer, Histoire

Henry MacRae

Production

John Hickson

Photographie

Alvin Todd

Montage