Melanie loves her work, but often forgets about her boyfriend. He feels neglected. Later, she takes some time for him, but her work gets in the way again. This leads to a big argument that ends in a break-up. To relax, Melanie goes to a massage studio. There she tells the Thai masseuse about her problems. After the massage, Melanie lies down in her bed. When she wakes up the next morning, she has aged decades. She tries to find out what happened. But she has to come to terms with the fact that she is now 70 years old.

The body of a young Mexican woman is found in the Main Valley, south of Würzburg. Inspector Peter Haller and his colleague Birgit Sacher are involved in solving the crime. Haller is not yet forty and was born in Würzburg. He has a quiet love for his city, for its clarity and familiarity. He will never fully understand how people can become criminals in such a beautiful environment. This is the secret drive behind his investigations, in which he is not just concerned with solving the case, but with looking into the soul of the perpetrator.

Martha and Helene Weiß - one a devout nun in a Swabian convent, the other a convinced atheist and mother. Two unequal sisters who almost only argue with each other. Martha's faith in particular is always a red rag for the younger and wilder Helene. But then Helene is involved in a car accident with her daughter and husband. However, when she wakes up in hospital and learns that her husband and child are dead, she feels no grief. She suffers from retrograde amnesia. In other words, she can still remember Pippi Longstocking, for example, but not her own family. Now it is Martha, of all people, who brings her to the convent and gives her support. But can she really trust this stranger?