S15, E8: Martin Gruber is seeing major changes in his life. Lilli has resigned. She is considering working with her boyfriend, Robert, in the workshop in the future. Franziska plans to look after Johann herself. Although everyone is happy about her recovery progress, saying goodbye to Martin's newborn son is difficult for the family. A call from school distracts him from private worries. The 16-year-old Fabian collapsed in class with acute shortness of breath. When Martin Gruber takes on the boy's case, he learns from the single mother Katharina Bichler what the son doesn't know. Even before he was born, a prenatal examination diagnosed a congenital genetic defect which the affected children usually do not survive infancy. Martin is amazed that Fabian has not shown any symptoms of the disease so far.