The corpse of an unknown young girl is discovered in a freight car in a medium-sized company in Osnabrück. Charlotte Lindholm gradually approaches the identity of the girl. She meticulously collects the few clues and first comes across Richard Voigt. He can identify the girl as 19-year-old Carol Stern from Ireland, who took part in his weaving course at the FH in Osnabrück. The case becomes increasingly mysterious when Charlotte discovers that this is neither her real name nor her real age. What did this girl want in Osnabrück? In the course of the investigation, Charlotte Lindholm also comes across the Mende family, for whom Carol worked as a babysitter. But she learns little about Carol there, as the family mourns the accidental death of their four-year-old son Frederik.
She hears from the neighbors that Frederik has suffered from a particularly severe form of ADHD (Attention Deficit Hyperkinetic Syndrome). The Mende family was faced with a crucial test due to the son's illness: Jürgen Mende, the father, wanted the illness to be treated with medication. His wife Simone didn't want to believe that her son was really ill, and Mika, the 17-year-old brother, just felt neglected. Is there a connection between the two deaths? What is Mika Mende, who works at the company where the murder victim was found, hiding? And Voigt, too, becomes increasingly entangled in contradictions. Did he know the victim better than he admits? Charlotte succeeds in putting the loose pieces of the puzzle together into a disturbing picture.
Her tenth murder case turns out to be part of a moving family tragedy.