Nancy Drew

Carson Drew

Challon

Theodore 'Ted' Nickerson

Captain Tweedy

Mary Eldredge

Effie Schneider, Drew's Maid

Hollister

Keiffer

Adam Thorne

Miss Tyson, the Nurse

Spud Murphy (uncredited)

Brinwood Student (uncredited)

Telegrapher (uncredited)

Miss Van Deering (uncredited)

Radio Station Technician (uncredited)

Radio Station Technician (uncredited)

Farmer (uncredited)

Brinwood Student with Black Hat (uncredited)

Dr. Raymond 'Ray' Spires (uncredited)

Mrs. Ray Spires (uncredited)

Brennan, the Gate Guard (uncredited)