Young Ronya Dan was found dead under the wall of Heidelberg Castle. A day later, a local pastor falls to his death after falling out of the window of his own house. A note addressed to him by Ronya is found in the deceased's pocket, the contents of which suggest that the girl was pregnant by him. The head of the Heidelberg Center police department, Seltmann, puts forward his version of what happened: the pastor, having killed the girl who was blackmailing him, could not bear the pangs of conscience and committed suicide. The case is closed. However, Hauptcommissar Theuer's instincts tell him that the real killer is alive. In defiance of everyone, even his loyal team, the virtuoso detective continues the investigation.