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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?