Ek Din Achanak is a 1989 art film directed by Mrinal Sen, based on a Bengali novel, Beej by Ramapada Chowdhury. Ek Din Achanak in Hindi can be loosely translated as, "One day, without warning." This movie beautifully captures the vagaries of life in a typical middle-class home in a nondescript city in India. The subject of the movie is one day a retired professor (Dr. Sreeram Lagoo) decides to go out for unknown work but doesn't come back, even there is no clue left behind. Family members, relatives and friends try hard but unable to come up with any satisfactory result.