Watch on Soap2day. Katja is a single mother of her six-year-old son. She has told him that his father is a famous musician. In reality, however, it is her childhood sweetheart Nick, with whom she wanted to emigrate to Australia. After some misunderstandings, however, he left alone and she stayed behind in Hamburg, unaware that she was pregnant. Now that a class reunion is coming up and Nick has announced his attendance, it's time to tell the truth.