Gustav Horstmann was a board member of a foundation that cared for families in need. After he is found dead in his burned-out house, the Kleve criminal police begin their investigation. Another body is recovered when the forensic team clears away the debris. In the basement, they discover images of missing children on a computer, whose families were supported by the foundation. What happened to the children? The police's investigative work is being observed by Frank Zech. He knows who the second victim is and what has transpired in the house over the past years. But he has every reason to remain silent.