Dementing 'granny' Birnbaum returned home, 'escaped' from her senior institution once more, but mistook the corpse of young adult Holger Träsch for a sleeper. Forensic professor Wolter finds he was fatally stabbed with a kitchen knife. He ran a complete amphetamine drug lab in the cellar, Jan Arnaud finds traces of a recent, now missing batch of the designer drug "Mephedron", as if it was stolen. Reident couple Ole and Belinda Birnbaum act shocked what went on in his ma's house, claiming they weren't there for long and never met Holger. His junkie sister Melanie Träsch weeps bitterly, her boyfriend Sven Weinzierl disliked Holger as her dealer. Elusive crime baron Klaus Bühler employed Melanie as nigh-club 'bar girl', Jo Stoll finds his car was at the crime scene, hard proof lacks until the contraband resurfaces.
—KGF Vissers