Barsaat Ki Ek Raat (English: One Rainy Night) is a 1981 Bollywood thriller film starring Amitabh Bachchan, Raakhee, Amjad Khan and Utpal Dutt. It was directed by Shakti Samanta. The film was simultaneously shot in two languages, Hindi and Bengali. The Bengali version, titled Anusandhan, became the highest grossing Bengali film of all time and remained at the spot for several years. The story was adapted from the novel Anushandhan by Shaktipada Rajguru. The Hindi version was an average grosser.