Karow searches for the killer of his former partner.

Karow is held hostage after his key witness gets gunned down in front of him.

A mentally-ill locksmith thinks he's receiving messages directing him to procure victims.

Rubin and Karow investigate a jogger attacked by a boar and a man murdered in a coffee kiosk.

Nina's son Tolja joins the police as an intern and gets shot on a routine call.

A secret society of law students exercise strange control over a new member.

The murder of a 90-year-old Berlin building tycoon appears to be politically motivated.