Marian Forbes has been having an affair with her boss and when he drops her for another woman. In an act of jealousy and greed she convinces an acquaintance to murder her former lover and then impersonate him just long enough to get their hands on a large sum of money.
Unfortunately the movie The 3rd Voice is not yet available on HBO Max.
| Writing | Hubert Cornfield | Writer |
| Directing | Hubert Cornfield | Director |
| Production | Hubert Cornfield | Producer |
| Writing | Charles Williams | Novel |
| Sound | Johnny Mandel | Original Music Composer |
| Production | Maury Dexter | Producer |
| Costume & Make-Up | Dick Hamilton | Makeup Artist |
| Art | John B. Mansbridge | Art Direction |
| Art | Mac Mulcahy | Set Decoration |
| Directing | Willard Kirkham | Assistant Director |
| Directing | Frank Parmenter | Assistant Director |
| Costume & Make-Up | Alma Johnson | Hairstylist |
| Camera | Ernest Haller | Director of Photography |
| Production | Harold E. Knox | Production Supervisor |
| Editing | John A. Bushelman | Editor |
