1980s film where a woman plots to kidnap an elderly man

A couple, cheated by a vile businessman, kidnap his wife in retaliation—without knowing that their enemy is delighted they did.

A man and his 92 year old grandmother kidnap, torture and kill women.

A young man kidnaps a young girl to impress his friends. When she gets an opportunity she knocks him out, ties him up, and interviews him back.

A spoiled rich girl hatches a plot with her hippie friends to "kidnap" her so they can get a large ransom from her wealthy father.

plot is unknown

A young woman seduces an older man and reveals her sinister intentions over a dinner date.

A woman living in a boarding house is kidnapped by a small-time criminal. Soon others in the gang try to take her away from him so they can get the ransom.

An aging dentist kidnaps a young man with intentions of killing him because he's had an affair with his wife, but an unlikely connection starts to form between them.

An 18-year-old begins dating a charming 50-year-old man who treats her to shopping sprees and fancy restaurants, creating a huge rift with her mother. Mom’s instincts prove right when the man becomes psychologically manipulative, turning the girl into an emotional prisoner in his mansiIon.

A man impersonates a nanny to infiltrate a millionaire's household and steal his fortune.