| Bonita Granville | ... | Nancy Drew |
 | John Litel | ... | Carson Drew |
| Frankie Thomas | ... | Ted Nickerson (as Frank Thomas Jr.) |
| Mary Lee | ... | Mary Nickerson |
| Dickie Jones | ... | Killer Parkins |
| Larry Williams | ... | Miles Lambert |
| Betty Amann | ... | Eula Denning |
| Thomas E. Jackson | ... | City Editor Bostwick (as Thomas Jackson) |
| Olin Howland | ... | Sergeant Entwhistle |
| Sheila Bromley | ... | Bonnie Lucas |
| rest of cast listed alphabetically: |
| Hooper Atchley | ... | The Chemist (uncredited) |
| Irving Bacon | ... | Tracy (uncredited) |
| Frankie Burke | ... | Beldenburg Hotel Bellboy (uncredited) |
| Nat Carr | ... | Dr. Carey, the Coroner (uncredited) |
| Glen Cavender | ... | Extra, Office Worker / Bedbug Hotel Passerby (uncredited) |
| Loia Cheaney | ... | Extra, Office Worker (uncredited) |
| Steve Clark | ... | Pedestrian (uncredited) |
| Jimmy Conlin | ... | Newspaper Morgue-Keeper (uncredited) |
| Clyde Courtright | ... | Hotel Doorman (uncredited) |
| John Dilson | ... | Deputy Coroner (uncredited) |
| Edgar Edwards | ... | Drunk (uncredited) |
| Jimmie Fox | ... | Gym Trainer (uncredited) |
| Paul Fung | ... | Mandarin Cafe Waiter (uncredited) |
| Willie Fung | ... | Mandarin Cafe Proprietor (uncredited) |
| Chester Gan | ... | Mandarin Cafe Headwaiter (uncredited) |
| Jack Gardner | ... | (uncredited) |
| Jack A. Goodrich | ... | Photographer in Courtroom (uncredited) |
| Sol Gorss | ... | Citizen Driver (uncredited) |
| William Gould | ... | The Judge (uncredited) |
| Eddie Graham | ... | Passerby Extra During Chase (uncredited) |
| Kit Guard | ... | Man at Gym Counter (uncredited) |
| George Guhl | ... | Police Guard at Lambert Estate (uncredited) |
| Florence Halop | ... | Phyllis Gimble, Journalism Student (uncredited) |
| Charles Halton | ... | Newspaper Publicity Man (uncredited) |
| Al Herman | ... | Gym Spectator (uncredited) |
| Harry Hollingsworth | ... | Policeman (uncredited) |
| William Hopper | ... | Bit Role (uncredited) |
| Jack Kenny | ... | Gym Spectator with Cigar (uncredited) |
| Joan Leslie | ... | Mayme, Journalism Student (uncredited) |
| Al Lloyd | ... | Extra, Pedestrian Outside Hotel (uncredited) |
| George Lloyd | ... | Maxie - Gym Attendant (uncredited) |
| Charles Marsh | ... | Beldenburg Hotel Engineer (uncredited) |
| Frank Mayo | ... | Man Leaving Courthouse (uncredited) |
| Jack Mower | ... | Deputy Coroner (uncredited) |
| Leonard Mudie | ... | Deputy District Attorney Garrett (uncredited) |
| George Offerman Jr. | ... | Tribune Office Boy (uncredited) |
| Frank Orth | ... | Captain Tweedy (uncredited) |
| Bob Perry | ... | Man at Gym Gate (uncredited) |
| Jack Perry | ... | Soxie Anthens (uncredited) |
| Jessie Perry | ... | Second Prison Matron (uncredited) |
| Renie Riano | ... | Effie Schneider, Drew Housekeeper (uncredited) |
| John J. Richardson | ... | Joe, Taxi Driver (uncredited) |
| John Ridgely | ... | Beldenburg Hotel Desk Clerk (uncredited) |
| Betty Roadman | ... | First Prison Matron (uncredited) |
| Cliff Saum | ... | Policeman Outside Courthouse (uncredited) |
| Charles Smith | ... | Charles, Journalism Student (uncredited) |
| Charles Sullivan | ... | Gym Spectator (uncredited) |
| Elliott Sullivan | ... | Pedestrian (uncredited) |
| Joanne Tree | ... | Bit Part (uncredited) |
| Lois Verner | ... | Theresa, Journalism Student (uncredited) |
| Jack Wagner | ... | Jack, Journalism Student (uncredited) |
| Pat West | ... | Jake, Gym Trainer (uncredited) |
| Leo White | ... | Extra, Office Worker (uncredited) |
| Jack Wise | ... | Extra, Office Worker (uncredited) |
| Walter Young | ... | Doctor Hibbard (uncredited) |
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