Introducing at night a railway building to spray graffiti, Lukas Sonntag falls from a ladder and incurs a dangerous electric shock, but is saved in ER. Mattes and Melanie find the secret codes of graffiti imply artist rivalry as possible motive, after convincing Lukas' leg-plastered buddy Philipp Peters, who stood guard but noticed no culprit, explains and even helps set a trap. It proves dangerous, also for Hans, who objected to experienced but out of practice Wolle as partner, yet he saves gas-poisoned Hans thanks to though research. Mattes finds last-minute that Lukas's bluntly neglectful selfish mother Esther and haughty girl friend Ava Schulte are the root cause of a tragic, devious plan coming to a fatal climax.
—KGF Vissers