When she goes through the evidence, she wears headphones. So no one hears the crying. The pleas, the screams. Karin M. is a commissioner at the BKA in Wiesbaden, responsible for sexual offenses against boys and girls and for child abuse. Their weapons are their eyes, their ears.

One minute moving image with sound. For half a year, Karin M. kept staring at this excerpt. Looking for anything conspicuous, a birthmark, a tattoo, a scar she might have overlooked. An object, a cuddly toy, for example. Just anything that would bring her one step closer to the tormented child. Nothing.

The narrow image section, the poor quality of the material: what was seen here could have happened yesterday or many years ago, around the corner or on the other side of the world. Only one thing was clear: perpetrators and victims spoke German.