1983, 90 min, USSR. Mosfilm. Directed by N. Mikhalkov. Starring: Irina Kupchenko and Mikhail Ulyanov. Based on S. Prokofieva's play, "A Conversation Without Witnesses".Upon visiting his ex-wife one day, he learns that she is planning on marrying an old friend about whom he once wrote a nasty anonymous letter. Fearing discovery, he demands that she break off the engagement. When she refuses, he threatens to reveal to their son that she is not his birth mother, forcing her to choose between her own personal happiness and the happiness of their son...