A strange, enigmatically attractive and charismatic visitor arrives at the home of a bourgeois family in Milan. Successively, he seduces each member of the family: the maid, the son, the daughter, the mother and, finally, the father. Then, in the same unexpected and mysterious way in which he arrived, he disappears, leaving them all mired in confusion. Now they must find a new meaning in their lives to fill the void left by the stranger.