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. This version is famous for its twist ending which alters significantly from the original novel.