Armin Rohde experienced as a "good cop" Fredo Schulz a controversial Special Investigation operation in the drug depot Berlin-Neukölln. A covert investigator was shot and Schulz, the widowed police officer, widower and ex-alcoholic at the end of his career, is charged with the resolution of the tricky case. Together with his partner, Chief Inspector Milan Filipovic, he manages to win the young dealer Dakota as an informant. But soon the two investigators will not let go of the feeling that they have a leak in their own ranks.