When Johanna diagnoses a little girl, Lena Straussberger, with a ruptured spleen after a fall, she has no idea that this is going to bring turmoil to her life. The results of a blood test indicate it is highly unlikely that Gerhard Straussberger really is Lena’s biological father. He flies into a rage and suggests that Lena may be the result of an affair between his wife Verena and Laurenz Hofer. Johanna finds that hard to believe - but now she has become uneasy. When Verena comes to her surgery, Johanna questions her and discovers that she really did have an affair with Laurenz. Johanna is stunned; she and Laurenz are in the middle of planning their wedding! But now nothing at all seems certain any more, especially her relationship with Laurenz.