Bonita Granville as Nancy Drew

John Litel as Carson Drew

James Stephenson as Challon

Frankie Thomas as Theodore 'Ted' Nickerson

Frank Orth as Captain Tweedy

Helena Phillips Evans as Mary Eldredge

Renie Riano as Effie Schneider, Drew's Maid

Charles Trowbridge as Hollister

Dick Purcell as Keiffer

Edward Keane as Adam Thorne

Mae Busch as Miss Tyson, the Nurse

Tommy Bupp as Spud Murphy (uncredited)

Betty Jane Graham as Brinwood Student (uncredited)

Stuart Holmes as Telegrapher (uncredited)

Vera Lewis as Miss Van Deering (uncredited)

Jack Mower as Radio Station Technician (uncredited)

John Ridgely as Radio Station Technician (uncredited)

Cliff Saum as Farmer (uncredited)

Joanne Tree as Brinwood Student with Black Hat (uncredited)

Brandon Tynan as Dr. Raymond 'Ray' Spires (uncredited)

Lottie Williams as Mrs. Ray Spires (uncredited)

Tom Wilson as Brennan, the Gate Guard (uncredited)