Martin Landau, a successful doctor, contemplates murdering a former mistress who threatens his easy life while Woody Allen, an unsuccessful filmmaker, contemplates having an extramarital affair. This film, alongside "Annie Hall," will one day be rated as one of Woody Allen's greatest achievements. It is an important, intelligent work that explores the implications of whether or not this is indeed a moral universe. It also very funny. The subplot about Allen making a film about his successful, conceited brother-in-law (Alan Alda.) A masterpiece. I doubt he will reach these heights again.