Jab Andheraa Hota Hai (1974)

The city is rocked by a serial killer who only kills young women at night, so women don't want to step outside the house when it turns dark. Vikram works for smuggler Sohanlal to support his family. He saves Roma after she is drugged at a her party and gets her home safely. They fall in love and want to get married. Vikram finds that Roma is daughter of his boss Sohanlal, who won't let them marry as Vikram's life is always at risk he wants Roma to marry Paratap Saxena, who has a disturbed past and can't get being ditched by his wife Alka. Vikram tries to be unlawful to Roma to stay away from her, where he is also suspected to be the serial killer.