Secret of the Blue Room

Lionel Atwill

Robert von Helldorf

Gloria Stuart

Irene von Helldorf

Paul Lukas

Captain Walter Brink

Edward Arnold

Commissioner Forster

Onslow Stevens

Frank Faber

William Janney

Thomas Brandt

Elizabeth Patterson

Mary, Cook

Robert Barrat

Paul, Butler

Muriel Kirkland

Betty, Maid

Russell Hopton

Max, Chauffeur

Anders Van Haden

The Stranger

James Durkin

Kruger, Commissioner's Assistant