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1h 14mNRDirected by Gordon Hessler
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.
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Amanda BlakeHelen Mercer
Tisha SterlingGretchen Addison / Adele Murphy
Dick HaymesHarold Porter
Sam GroomJay
Britt LeachFred Hawkes
Ted GehringPolice Sergeant
Dennis CrossHighway Patrolman
Vernon WeddleSavings Officer
Rene BondBetty
Lucille BensonEunice RussellAvailability for Betrayal by JustWatch, via TMDB. All options