Inspector Maria Voss and fellow detective Teo are called to a field in Brandenburg, where a charred body lies. The victim is 15-year-old Bente, a school dropout and foster child living on the isolated Strand family farm. The forensic exam reveals a key in her stomach. Questions abound: Where was she heading, carrying two cans of gasoline? Why did the local gas station attendant sell gasoline to a known arsonist? What does the key unlock?