Wealthy widow Helen Mercer hires a young woman, Gretchen Addison, to act as her personal assistant and companion. Unfortunately, Helen is a poor judge of character, as Gretchen is part of a murderous extortionist duo with her boyfriend, Jay. However, Gretchen has second thoughts when she develops genuine affection for Helen. When Gretchen informs Jay that she wants to call off their plot, he refuses and carries on with the plan. Now both Helen and Gretchen may be in grave danger.
Unfortunately the movie Betrayal is not yet available on Disney Plus.
| Directing | Gordon Hessler | Director |
| Writing | Doris Miles Disney | Novel |
| Writing | James M. Miller | Teleplay |
| Production | Gerald W. Abrams | Associate Producer |
| Costume & Make-Up | Fred B. Phillips | Makeup Artist |
| Production | Charles W. Fries | Executive Producer |
| Production | Eddie Foy III | Casting |
| Art | Solomon Brewer | Set Decoration |
| Editing | John A. Martinelli | Editor |
| Production | Gerald I. Isenberg | Producer |
| Camera | Jacques R. Marquette | Director of Photography |
| Sound | Ernest Gold | Original Music Composer |
| Production | Joe Wonder | Production Manager |
| Costume & Make-Up | Marie Brown | Costumer |
| Directing | Mary Yerke | Script Supervisor |
| Sound | Robert J. Litt | Recording Supervision |
| Camera | Robert Blair | Key Grip |
| Editing | Robert Papazian | Supervising Editor |
| Directing | Maury Dexter | Assistant Director |
| Art | Sam Bergman | Property Master |
| Production | Jerry Wineman | Location Manager |
| Costume & Make-Up | Gertrude Wheeler | Hairstylist |
| Editing | Scott C. Eyler | Assistant Editor |
| Sound | John Mick | Music Editor |
| Sound | Charles T. Knight | Sound Mixer |
| Lighting | Robert A. Petzoldt | Gaffer |
| Production | Elliot Friedgen | Production Executive |
