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 | Doris Miles Disney | Novel |
| Writing | James M. Miller | Teleplay |
| Directing | Gordon Hessler | Director |
| Sound | Ernest Gold | Original Music Composer |
| Camera | Jacques R. Marquette | Director of Photography |
| Editing | John A. Martinelli | Editor |
| Camera | Robert Blair | Key Grip |
| Sound | John Mick | Music Editor |
| Editing | Robert Papazian | Supervising Editor |
| Production | Joe Wonder | Production Manager |
| Editing | Scott C. Eyler | Assistant Editor |
| Production | Elliot Friedgen | Production Executive |
| Production | Eddie Foy III | Casting |
| Costume & Make-Up | Gertrude Wheeler | Hairstylist |
| Directing | Mary Yerke | Script Supervisor |
| Production | Gerald W. Abrams | Associate Producer |
| Production | Gerald I. Isenberg | Producer |
| Costume & Make-Up | Marie Brown | Costumer |
| Art | Sam Bergman | Property Master |
| Art | Solomon Brewer | Set Decoration |
| Production | Charles W. Fries | Executive Producer |
| Directing | Maury Dexter | Assistant Director |
| Production | Jerry Wineman | Location Manager |
| Sound | Charles T. Knight | Sound Mixer |
| Sound | Robert J. Litt | Recording Supervision |
| Costume & Make-Up | Fred B. Phillips | Makeup Artist |
| Lighting | Robert A. Petzoldt | Gaffer |
