On a routine callout, Wuppertal police officer Luise Berg is horrified to meet Dennis Opitz, who murdered her daughter Merle and has been released from prison early. As more murders occur, Luise investigates Dennis' dark past and discovers that the young man who now seems to be a model member of society is on a quest for revenge. No one believes Luise. Not even when she herself - and more precisely, her youngest daughter Josi – become the focus of Dennis' perfidious plan.
