De eenzame weduwe Helen Mercer (Amanda Blake) neemt een jonge vrouw in dienst als gezelschapsdame. Helen is er zich echter niet bewust van dat de vrouw en haar vriend leven van moord en afpersing. De twee vatten het plan op de weduwe tot hun volgende slachtoffer te maken...
Nee, helaas is Betrayal nog niet beschikbaar op Netflix in Nederland.
| Writing | James M. Miller | Teleplay |
| Directing | Gordon Hessler | Director |
| Writing | Doris Miles Disney | Novel |
| Sound | Ernest Gold | Original Music Composer |
| Art | Solomon Brewer | Set Decoration |
| Production | Gerald W. Abrams | Associate Producer |
| Editing | John A. Martinelli | Editor |
| Costume & Make-Up | Fred B. Phillips | Makeup Artist |
| Camera | Jacques R. Marquette | Director of Photography |
| Production | Charles W. Fries | Executive Producer |
| Production | Gerald I. Isenberg | Producer |
| Production | Eddie Foy III | Casting |
| Editing | Scott C. Eyler | Assistant Editor |
| Production | Elliot Friedgen | Production Executive |
| Production | Jerry Wineman | Location Manager |
| Sound | Robert J. Litt | Recording Supervision |
| Costume & Make-Up | Marie Brown | Costumer |
| Sound | Charles T. Knight | Sound Mixer |
| Lighting | Robert A. Petzoldt | Gaffer |
| Sound | John Mick | Music Editor |
| Directing | Maury Dexter | Assistant Director |
| Directing | Mary Yerke | Script Supervisor |
| Camera | Robert Blair | Key Grip |
| Costume & Make-Up | Gertrude Wheeler | Hairstylist |
| Production | Joe Wonder | Production Manager |
| Art | Sam Bergman | Property Master |
| Editing | Robert Papazian | Supervising Editor |
