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 HBO Max.
| 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 |
