Nancy Drew and the Hidden Staircase

Renie Riano

Effie Schneider

Vera Lewis

Rosemary Turnbull

Louise Carter

Floretta Turnbull

William Gould

Daniel Talbert

George Guhl

Smitty

John Ridgely

Reporter

William Hopper

Reporter

Creighton Hale

Reporter

Frank Mayo

Tribune Photographer

Frederic Tozere

District Attorney's Investigator

Don Rowan

Phillips

Dick Elliott

McKeever

Fern Barry

McKeever's Secretary (uncredited)

Nat Carr

Policeman (uncredited)

Sol Gorss

Reporters' Driver (uncredited)

Frank Meredith

Motorcycle Policeman (uncredited)