Otto Friedrich Dennert is a celebrated veteran of the Essen police force. While investigating a series of killings of women he reaches retirement age. The case is taken over by a new team, including Dennert's son Harry. Convinced that they have arrested the wrong person, Dennert begins investigating by himself with assistance from the criminal underworld.

Otto Dennert, auch „Der Greifer“ genannt, ist Kommissar der Mordkommission bei der Kriminalpolizei in Essen und steht kurz vor der Pensionierung