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