The siblings Christine and Stefan have grown up separately because of the divorce of their parents and don't know each other so far. Only as adults they get to know each other. She lives in Barcelona, while he lives with his mother in Baden-Baden. During her visit to Baden-Baden, they come closer. She is aware that she enters into a forbidden relationship and imagines that it is only a very close sibling relationship and not an intimate love one. She is torn between dislike and affection for the him, and enters into other circumstances in order to suppress the love for the him.