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

Henry MacRae

Producer

Ray Taylor

Director

John Hickson

Director of Photography

Alvin Todd

Editor

Harold M. Atkinson

Scenario Writer, Story