A day in the life of an unfaithful married couple and their steadily deteriorating relationship.
Financier persuades his mistress to marry a rich industrialist for his money, then discovers that he and the new wife are to be murdered by her new husband.
After returning from a business trip in Finland, Bruno (Bruno Ganz) find that his wife Marianne (Edith Clever) wants her husband to leave her alone with their son. A struggle with loneliness and adapting to the new situation ensues.
The siblings Christine and Stefan grew up separated from each other due to their parents' divorce and have no knowledge of each other. Later in life they meet and enters into a relationship.