Kohraa (The Fog) is a 1964 Indian thriller horror film directed by Biren Nag, starring Waheeda Rehman, Biswajeet and Lalita Pawar. The film was adapted from Daphne du Maurier's 1938 novel Rebecca, which was previously adapted by Alfred Hitchcock as Academy Award-winning Rebecca (1940), though some supernatural elements were added to it, including a few from the movie Psycho. This version is famous for its twist ending, which differs significantly from that of the original novel. It was not a box office hit.