A serial killer is unsettling Berlin.
His third victim, an elderly lady, is found lying on her living room table, dressed in a pure white shirt.
The apartment has been meticulously cleaned - a nightmare for any forensic scientist.
The Homicide Department's last hope to find the "Cleaner" is Julius Kern.
In the past, he managed to uncover the ruthless perpetrator of a mass murder.
But then he almost collapsed.
Now, as Kern slowly regains his old form, his opponent already has his next victim in his sights...