Two happily married couple, Michal and Blanka, experience a regrettable misunderstanding: the wife leaves home with their young son, but unfortunately her husband does not find the explanatory letter. Normally, he would wait for the matter to resolve itself, as he does not believe that his wife would just leave him, but he is under a lot of pressure: from his own parents, his neighbor, his mother-in-law, and his "good friends." They all advise him that the only solution is an immediate divorce. After a week, everything is explained, Michal finds Blanka's note and realizes how little he trusted Blanka and how easily he believed others...