Nora Wagner was murdered at home, while her teen daughter Tilda was gaming with headphones. Prime suspect is Nora's ex-husband Lars Wagner, being in a legal fight for custody of Tilda. Also two young male robber acquaintances of Tilda, and her connected martial arts coach. Finally Nora's employer, adhesives factory owner Olaf Möhrs. Then a DNA result requires reconsidering.—KGF Vissers